Question:
I didn’t state that they were identical. I did state that they are built to the same Federal Standard. That means they are quite similar in design.
I’m not sure on the validity of that statement. I’ll bet if one were to look one might find any number of different approaches to solving different issue via given sets of standards.one example which comes to mind was the issue of the grooves on ping golf clubs and those of others. Both were built to pga standards. But qualification was left to the interpretation of standards, resulting in different designs and different results. I’m willing to bet there are better examples out there. MLM
Response:
Per the Goodyear website (http://www.goodyear.com/rv/products/classes.html) they list 3 trailer rated tires: Marathon (ST) is recommended for 5W, TT and other trailers G614RST (ST) is recommended for 5W and TT Wrangler (LT) is recommended for 5W and Class B MH’s They do not list any other P, LT or RV tires for trailers nor any ST tires for motorized RV’s. I’m sure there is at least one among us who will point out that Goodyear doesn’t "forbid" using other tires and would therefore assume this implies that such use is OK. Personally I would base my tire purchase decision on the recommendations by the manufacturer. Use your own best judgement and buy whatever you feel is appropriate. CruzMastr
– Hide quoted text — Show quoted text – It’s time to replace the tires on my fifth wheel and I was thinking about switching from an ST ( Special Trailer ) to an LT ( Light Truck ) in a slighlty heavier range – like C to D. I’d like thoughts and opinions on such a move. TIA.
Response:
How do you conclude that some minimum federal standards makes the ST tire the same as the LT tire?
I didn’t state that they were identical. I did state that they are built to the same Federal Standard. That means they are quite similar in design. And yes I know P tires are different from LT tires just as ST tires are DIFFERENT from LT tires.
That statement leaves the wrong impression. ST and LT tires are quite similar, while P tires are far different from ST and LT tires. I don’t think I would put ST tires on my truck and LT tires on my trailer.
I wouldn’t put ST tires on my truck, but I might put LT tires on my trailer–just as do many trailer manufacturers. It just won’t be right.
Why would it not be "right"? — D.J., N8DO; FMCA 147762 davidjosborn at sbcglobal dot net
Response:
Per the Goodyear website
(http://www.goodyear.com/rv/products/classes.html) they list 3 trailer rated tires: Marathon (ST) is recommended for 5W, TT and other trailers G614RST (ST) is recommended for 5W and TT Wrangler (LT) is recommended for 5W and Class B MH’s They do not list any other P, LT or RV tires for trailers nor any ST tires for motorized RV’s. I’m sure there is at least one among us who will point out that Goodyear doesn’t "forbid" using other tires and would therefore assume this implies that such use is OK. Personally I would base my tire purchase decision on the recommendations by the manufacturer. Use your own best judgement and buy whatever you feel is appropriate.
Tires are controlled by the Federal Motor Vehicle Safety Standards (FMVSS), which can be found at http://www.access.gpo.gov/nara/cfr/waisidx_00/49cfr571_00.html . Passenger tires are controlled by FMVSS 109 and FMVSS 120 and other tires are controlled by FMVSS 119 and FMVSS 120. Passenger tires must have their load ratings reduced by ten percent when they are used on vehicles other than passenger cars. Additional useful information can be found in the Goodyear "Engineering Data Over-The Road Truck Tires" book available at no charge from Goodyear. — D.J., N8DO; FMCA 147762 davidjosborn at sbcglobal dot net
Response:
DJ, Trailer tires are for trailers and truck tires are for trucks and like you said there is a difference. Some trailer manufactures do put on LT tires because they will "work". When I wear out my Goodyear Marathons load range "D" (2540 lbs) I will replace them with the same. I want the best tire for the application, thats why I will not use a LT tire on my trailer. Just for information I put over 8000 miles on my Marathons and they show little wear. Great tire! Enough of this tire Stuff 
I’m done
Hey TinFoil Dome, did you get what David said. Some manufacturers are equipping their 5th wheel trailers with LT tires. Glad you’re done with this tire stuff as you apparently don’t know what you’re talking about. HD in FL
Response:
Be aware that trailer tires have a compound that will hold up to more years of UV before drying out & cracking. Unless you’re putting on a lot of miles, chances are the tires will start to crack before they wear out if you switch to non trailer tires. -Jeff Deeney-
I question that. Maybe if the trailer sits for long periods that may be true but it doesn’t seem to be any different for ST or LT tires in the real world. Motorhomes certainly don’t use ST tires and they need new tires every 5 to 7 years same as trailers using ST tires. HD in FL
Response:
It’s time to replace the tires on my fifth wheel and I was thinking about switching from an ST ( Special Trailer ) to an LT ( Light Truck ) in a slighlty heavier range – like C to D. I’d like thoughts and opinions on such a move. TIA.
You didn’t say what size wheel this is on. However, if you’re talking about LR ‘C’ tires, they probably have 15" rims. Good luck finding an LT tire in that size. — James Summers 1996 turbo-diesel Chevy + 1994 30′ Carri-Lite fifth-wheel email to: UseNet1 ayt mcsummation dotting com
Response:
Be aware that trailer tires have a compound that will hold up to more years of UV before drying out & cracking. Unless you’re putting on a lot of miles, chances are the tires will start to crack before they wear out if you switch to non trailer tires. -Jeff Deeney-
Response:
Trailer tires are for trailers and truck tires are for trucks and like you said there is a difference. Some trailer manufactures do put on LT tires because they will "work".
They put LT tires on their trailers because they need the load-carrying capacity. When I wear out my Goodyear Marathons load range "D" (2540 lbs) I will replace them with the same.
What is the *measured* load on each tire? I want the best tire for the application, thats why I will not use a LT tire on my trailer.
LT tires *are* the "best tire for the application" on some trailers. Just for information I put over 8000 miles on my Marathons and they show little wear. Great tire!
I never indicated that they weren’t–although some people have had significant problems with them. Enough of this tire Stuff I’m done
Bye. — D.J., N8DO; FMCA 147762 davidjosborn at sbcglobal dot net
Response:
DJ, Trailer tires are for trailers and truck tires are for trucks and like you said there is a difference. Some trailer manufactures do put on LT tires because they will "work". When I wear out my Goodyear Marathons load range "D" (2540 lbs) I will replace them with the same. I want the best tire for the application, thats why I will not use a LT tire on my trailer. Just for information I put over 8000 miles on my Marathons and they show little wear. Great tire! Enough of this tire Stuff I’m done
– Hide quoted text — Show quoted text – How do you conclude that some minimum federal standards makes the ST tire the same as the LT tire? I didn’t state that they were identical. I did state that they are built to the same Federal Standard. That means they are quite similar in design. And yes I know P tires are different from LT tires just as ST tires are DIFFERENT from LT tires. That statement leaves the wrong impression. ST and LT tires are quite similar, while P tires are far different from ST and LT tires. I don’t think I would put ST tires on my truck and LT tires on my trailer. I wouldn’t put ST tires on my truck, but I might put LT tires on my trailer–just as do many trailer manufacturers. It just won’t be right. Why would it not be "right"? — D.J., N8DO; FMCA 147762 davidjosborn at sbcglobal dot net
Response:
The construction of trailer tires differ greatly from automotive tires.
I’m well aware of that fact–as my previous post indicated. LT tires are completely different from P tires. As I previously stated, LT and ST tires are built to the *same* Federal Standard. P tires are built to a completely *different* Federal Standard. LT and P tires have more flexable sidewalls and built with less material.
Once again: LT tires are completely *different* from P tires. Why can’t you understand that? The Goodyear Marathon is a excellent tire with heavy constuction.
I’m well aware of that fact. If you want proof of the tires construction and specifications I suggest you contact Goodyear Tire and Rubber.
I have Goodyear’s data book on their trailer and truck tires, and so I’m well aware of how they are constructed. And yes, the LT, ST and P that is stamped on the tire does mean something. It’s not just pretty decorations.
I’m well aware of that fact–as my previous post indicated. — D.J., N8DO; FMCA 147762 davidjosborn at sbcglobal dot net
Response:
How do you conclude that some minimum federal standards makes the ST tire the same as the LT tire? And yes I know P tires are different from LT tires just as ST tires are DIFFERENT from LT tires. I don’t think I would put ST tires on my truck and LT tires on my trailer. It just won’t be right.
– Hide quoted text — Show quoted text – The construction of trailer tires differ greatly from automotive tires. I’m well aware of that fact–as my previous post indicated. LT tires are completely different from P tires. As I previously stated, LT and ST tires are built to the *same* Federal Standard. P tires are built to a completely *different* Federal Standard. LT and P tires have more flexable sidewalls and built with less material. Once again: LT tires are completely *different* from P tires. Why can’t you understand that? The Goodyear Marathon is a excellent tire with heavy constuction. I’m well aware of that fact. If you want proof of the tires construction and specifications I suggest you contact Goodyear Tire and Rubber. I have Goodyear’s data book on their trailer and truck tires, and so I’m well aware of how they are constructed. And yes, the LT, ST and P that is stamped on the tire does mean something. It’s not just pretty decorations. I’m well aware of that fact–as my previous post indicated. — D.J., N8DO; FMCA 147762 davidjosborn at sbcglobal dot net
Response:
- Hide quoted text — Show quoted text – It’s time to replace the tires on my fifth wheel and I was thinking about switching from an ST ( Special Trailer ) to an LT ( Light Truck ) in a slighlty heavier range – like C to D. I’d like thoughts and opinions on such a move. TIA. Many fifth-wheel trailers have LT tires. The only possible disadvantage that I can see is that (I believe) ST tires may be more resistant to UV damage from sunlight exposure. Therefore, I would keep the LT tires covered when not actually in use. Of course, if I had ST tires I would also keep *them*covered when not in use.
Good advice David. HD in FL
Response:
DJ Osborn The construction of trailer tires differ greatly from automotive tires. LT and P tires have more flexable sidewalls and built with less material. The Goodyear Marathon is a excellent tire with heavy constuction. If you want proof of the tires construction and specifications I suggest you contact Goodyear Tire and Rubber. And yes, the LT, ST and P that is stamped on the tire does mean something. It’s not just pretty decorations.
– Hide quoted text — Show quoted text – These ‘Special Trailer’ (ST) tires have been constructed for better high speed durability and bruise resistance under heavy loads. I simply do not believe that statement. If you have some *evidence* to support it, then please provide it. If you don’t provide that evidence, then I’ll continue to believe the statement is false. Trailer tire construction varies substantially from automotive tires, therefore it is essential to choose the correct tire for your towing application. Trailer tires and truck tires are constructed to meet the same Federal Standard, and so there is very little difference between them. In general, trailer tires have the same load range (or ply) from bead to bead and are bias ply construction. That may have been the case at one time, but it is not generally the case now. This allows for a stiffer side wall which provides safer towing by helping to reduce trailer sway problems. The use of ‘Passenger Car’ (P) or ‘Light Truck (LT) tires a on a trailer is not recommended because their construction, usually radial or bias belted, allows for more flexible side walls. Passenger tires are not recommended on a trailer, and, in fact, must have their load capacity de-rated by ten percent when used on a trailer. However, ST and LT tires are very similar in construction, and I would be very surprised if a radial ST tire had stiffer sidewalls than did a radial LT tire in the same size and load rating. This could lead to increased trailer sway and loss of control. As noted above, there is very little difference between ST and LT tires in the same size and load rating. — D.J., N8DO; FMCA 147762 davidjosborn at sbcglobal dot net
Response:
It’s time to replace the tires on my fifth wheel and I was thinking about switching from an ST ( Special Trailer ) to an LT ( Light Truck ) in a slighlty heavier range – like C to D. I’d like thoughts and opinions on such a move. TIA.
Many fifth-wheel trailers have LT tires. The only possible disadvantage that I can see is that (I believe) ST tires may be more resistant to UV damage from sunlight exposure. Therefore, I would keep the LT tires covered when not actually in use. Of course, if I had ST tires I would also keep *them*covered when not in use. — D.J., N8DO; FMCA 147762 davidjosborn at sbcglobal dot net
Response:
That is my understanding of the ST tires also. However, I notice that a number of RV trailer manufacturers are now including LT tires as standard. So, is the LT ok to use in trailer service now?
These ‘Special Trailer’ (ST) tires have been constructed for better high speed durability and bruise resistance under heavy loads. Trailer tire construction varies substantially from automotive tires, therefore it is essential to choose the correct tire for your towing application. In general, trailer tires have the same load range (or ply) from bead to bead and are bias ply construction. This allows for a stiffer side wall which provides safer towing by helping to reduce trailer sway problems. The use of ‘Passenger Car’ (P) or ‘Light Truck (LT) tires a on a trailer is not recommended because their construction, usually radial or bias belted, allows for more flexible side walls. This could lead to increased trailer sway and loss of control.
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Response:
These ‘Special Trailer’ (ST) tires have been constructed for better high speed durability and bruise resistance under heavy loads.
I simply do not believe that statement. If you have some *evidence* to support it, then please provide it. If you don’t provide that evidence, then I’ll continue to believe the statement is false. Trailer tire construction varies substantially from automotive tires, therefore it is essential to choose the correct tire for your towing application.
Trailer tires and truck tires are constructed to meet the same Federal Standard, and so there is very little difference between them. In general, trailer tires have the same load range (or ply) from bead to bead and are bias ply construction.
That may have been the case at one time, but it is not generally the case now. This allows for a stiffer side wall which provides safer towing by helping to reduce trailer sway problems. The use of ‘Passenger Car’ (P) or ‘Light Truck (LT) tires a on a trailer is not recommended because their construction, usually radial or bias belted, allows for more flexible side walls.
Passenger tires are not recommended on a trailer, and, in fact, must have their load capacity de-rated by ten percent when used on a trailer. However, ST and LT tires are very similar in construction, and I would be very surprised if a radial ST tire had stiffer sidewalls than did a radial LT tire in the same size and load rating. This could lead to increased trailer sway and loss of control.
As noted above, there is very little difference between ST and LT tires in the same size and load rating. — D.J., N8DO; FMCA 147762 davidjosborn at sbcglobal dot net
Response:
It’s time to replace the tires on my fifth wheel and I was thinking about switching from an ST ( Special Trailer ) to an LT ( Light Truck ) in a slighlty heavier range – like C to D. I’d like thoughts and opinions on such a move. TIA.
Response:
These ‘Special Trailer’ (ST) tires have been constructed for better high speed durability and bruise resistance under heavy loads. Trailer tire construction varies substantially from automotive tires, therefore it is essential to choose the correct tire for your towing application. In general, trailer tires have the same load range (or ply) from bead to bead and are bias ply construction. This allows for a stiffer side wall which provides safer towing by helping to reduce trailer sway problems. The use of ‘Passenger Car’ (P) or ‘Light Truck (LT) tires a on a trailer is not recommended because their construction, usually radial or bias belted, allows for more flexible side walls. This could lead to increased trailer sway and loss of control.
– Hide quoted text — Show quoted text – It’s time to replace the tires on my fifth wheel and I was thinking about switching from an ST ( Special Trailer ) to an LT ( Light Truck ) in a slighlty heavier range – like C to D. I’d like thoughts and opinions on such a move. TIA.