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Old 04-07-2015, 09:37 AM   #15
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If you run E rated tires at 80psi you'll wear the centers of the tire out too soon. You need to run the sticker psi. If its 65psi then run that.

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Old 04-07-2015, 12:45 PM   #16
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I've used 225 75R 15 E rated tires on two trailers @80 PSI and the tires wore enenly. The centers didn't wear any differently than the rest of the tire.

I just feel better running E rated tires.

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Old 04-07-2015, 12:49 PM   #17
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The trouble with going to LT tires from ST ones is that the LT's are not designed for the twisting forces that occur during tight turns on multi axle trailers.
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Old 04-07-2015, 12:56 PM   #18
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I do not think you will wear the center of a tire faster than the edges until you OVER inflate the max rated psi.
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Old 04-07-2015, 01:00 PM   #19
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If you are trying to find the right tire you can do it two ways.
1: Take the maximum gross vehicle weight rating of the trailer
Add 25% to 1,000 pounds (Whichever is less) divide by 2 and search charts.

2-E-mail your favorite tire company

Cooper or Michelin would be my choices in tire companies.
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Old 04-09-2015, 05:07 PM   #20
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Being a consumer of tires for over 50 years , I'd have to say its a bit of a crap shoot lately finding a correctly rated tire that's manufactured according to ratings. Lots of jip joints in the biz ! Greedy and dishonest people. Find someone you trust. While on the road in a pinch, that's difficult but you can try your best.
I recently had a blowout on a 18500 gross alfa triaxle with st235-85-16 with 3960# rating. The dealer tried to give me a lt235 with a 3025#rating after the warrenty people okd his price quote on a Carlisle. He had to go back and find me a Hercules st235 to fit the bill. I know Hercules and like them. Now, how can anyone say a tire rated at less (lt), can be better than one rated at more (st) ?
So I say do your homework and hope and pray for the best.
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Old 04-09-2015, 08:12 PM   #21
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I amlooking at replacing the Towmax ST235/80R16E tires on my Keystone, Alpine 3600RS with a new set of 4 TaskMaster Provider ST235/85R16G trailer tires. I blew out one last December, and I am looking at the manufacturer starting to upgrade to these 14 ply tires on the new models of my camper. The dry ship weight is listed as 12226 lbs, I scaled the camper only last year at 12900 lbs with only dishes aboard, not ready for a week of camping. I am already equipped with the Dexter 7000 lb axles, and I wish for a decent replacement for the TowMax factory tires.
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Old 04-10-2015, 08:38 PM   #22
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I repaced GY ST 225 75 15 at 2600 lbs per tires on 5000lbs axles that never lasted more then 2 years. Found cheap LT load Range C 235 75 15 rated at 1920 lbs at 50 lbs air pressure. Inflated them to 60 psi and drove those tires for 7 years withour any issues and they never wore off. Traded the unit with them still looking great.
I will overload an LT tire on my unit before even looking on an other ST tire replacement.
I have LT from China on my unit that are G rate and 7 yeats old. Replacement on an emergency will be LT LR E truck tire for sure.
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Old 04-19-2015, 01:14 PM   #23
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Your RV is suppose to have, by law, a tire information plate. Usually on driver side near front to TT. This should have the MAX load ratings for the axles and the MAX total weight.
Now the tires if inflated to the pressure on the sidewall are suppose to be able to carry the stated GAWR BUT that assumes each axle and each side of each axle is evenly split or 50/50 between axles and 50/50 each end of each axle.

BUT in reality many discover the load is split more like 47/53 axle to axle (not tellin which is heavier as not always the front is heavy.
Also side to side can be out as much as 45/55.

If you can't find truck scale with enought side clearance to allow just one side to be weighed at least get the unit weighed with just one axle at a time on the scale.
A worksheet on how to do the calculations is available HERE.

Retired Design & Quality Tire Eng. Read my tire blog RVTireSafety.NET to learn more about RV tires, valves & wheels. Read THIS post on why Tires Fail
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