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Are Trailer Tires Better for a Trailer than Light Truck Tires  

Question:

I have a forty foot trailer I pull with a F350 dually and have been running LT tires on it. I haul round bales of hay with this trailer and it is the norm for it to weigh in around 19,400 lbs loaded, I have been having problems with tires coming apart and the folks I have been buying the tires from always find a reason not to stand behind them I had asked many times if there were trailer tires offered instead of Light truck and was told I was buying the best tire I could for what I use the trailer now I find out that there are trailer tires in the size I use so my question is are they a better tires than the LT and what are the differences? I would also like you to explain why a tire is rated for less weight when used as dual than when used alone. The tire size I use is 235-85-16 E rated

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Expert Reply:

Light truck tires (LT) are sometimes used in RV applications but generally not on utility trailers. Light truck tires are a type of passenger vehicle tire and as such they are not built with as thick of a sidewall as trailer tires. A thicker sidewall allows a trailer tire to handle more vertical load. I recommend going with ST trailer tires. The ST stands for special trailer.

A trailer tire can fail for several reasons. Overloading a tire can cause it to fail. You are towing a lot of weight and if the tires are not rated high enough that would be the issue. Other common problems with tires is heat build-up which is the number 1 enemy of a tire. Because trailer tires have a thicker sidewall they can build up more heat when under inflated. That is why trailer tires should always be inflated to the maximum psi as indicated on the tire.

For a trailer tire in size ST235/85-16 I recommend # AM10501 which is a load range F rated for 3,960 pounds at 110 psi. In a dually application the capacity is reduced because the additional tires on the axle help to even out the capacity because more of them are used. The weight is also distributed differently.

Also, the trailer tires we carry, unless otherwise indicated, have a 65 mile per hour speed rating. Faster speeds can build up more heat faster and can lead to premature wear and failure.

expert reply by:
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Michael H

Russell S.

6/21/2020

What would be a affordable tire sold by you for a 5 x 10 utility trailer for round trip from Memphis,Tn to California and back. I don't know trailer weight (mesh Floor with Ramp) but it will be hauling a 950 LB motorcycle....Thanks

Etrailer Expert

Chris R.

6/24/2020

Can you tell me what tire size is currently on the trailer?

Russell S.

6/24/2020

@ChrisR 205/75/14
Etrailer Expert

Chris R.

6/29/2020

@RussellS Thanks for the info! The Contender # C20514C is a great option here. It features a load capacity of 1,760 lbs at 50 psi and an excellent speed rating of 81 mph, perfect for a long-distance road trip.

Dale W.

5/13/2020

Looking for 15 inch wheels and tires my fifth wheel with a 5 lug bolt pattern. Can you help

Etrailer Expert

Chris R.

5/15/2020

Absolutely. We have a large selection of 15" trailer tires and wheels available (I've linked them below). I can definitely make a specific recommendation if you can tell me what particular size tire you're replacing. There should be a size listing right on the tire's sidewall.

Dale W.

5/15/2020

My real old tires are F78/15 bias. I'm only taking the 28 foot fifth wheel 600 miles then parking it. Will your Loadstar ST205/75D15 work? 80.16 dollars. Free shipping? Will need 4 tires!
Etrailer Expert

Chris R.

5/18/2020

The 205/75D15 tire size is essentially the modern equivalent of your older F78/15 units, so it will work perfectly as a replacement. The Loadstar # AM3S640DX for a tire/wheel combo or part # AM1ST92 for the tire only is a great choice. We do currently offer free shipping for orders over $99.

Tom M.

4/3/2020

I have a custom 1989 22 ft Airstream. Weight is 4500#s. Made from a 1973 31 ft. Has dual axle and tires are Kendra M S 235/75-15 tires, tread is 4 ply, side is 2 ply.Those were put on when on a trip, all the dealer had at the time. I have been thinking about changing out to new tires, but would like trailer tire with higher sidewall rating and if possible 1” white walls. Also, would LT truck tires work?

Chris R.

4/5/2020

Do you know what size tires were originally on the Aistream? I think your best option is to go back to that size, but upgrade to a higher load range option. If you happened to have 225/75-15 size tires (which are pretty common), I highly recommend the Provider # TR225LRE, which features a maximum load of 2,830 pounds at 80 psi and a speed rating of 81 mph. I do NOT recommend using LT truck tires, as they simply aren't designed to support the heavier loads of a trailer.

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