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Old 10-08-2015, 04:50 PM   #41
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Posts: 147
Originally Posted by Oaklevel View Post
That's really interesting. Esp if you took into account tongue weight.
On my trailer the GVWR is about 700lbs more than the combined load rating of the tires. If you don't take tongue weight into account, the tires are overloaded when the trailer is sitting in a parking lot.
My assumption of tongue weight may be a little bit light, but not enough to change the conclusion.

I also called Dexter who makes the Torflex axles on my trailer. I got through to an engineer who agreed that the axle force constants won't be exactly equal for each wheel. (The torsion axle relies on rubber to create its springiness.) He agreed that it wouldn't be unreasonable to assume that one tire might get 10% more weight than another. So even if everything else is perfect, one shouldn't assume equal loading on all four (or six) tires. The engineer was quick to also point out that trailers come out of the factory imbalanced, with more weight on one set of tires than on the other due to asymmetrical loads like slide outs. As far as I can tell, FR assumes equal loading on all tires.

Carlisle Tire recommends allowing a 20% margin between trailer weight and combined tire load rating. It's easy to understand why this makes sense because it would allow for the above effects without overloading the tires.

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Old 10-12-2015, 06:37 PM   #42
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Join Date: May 2015
Location: Central Oklahoma
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Get the SaferCar App for your phone. Then while you wait for the Tow Truck, you can file the complaint with NHTSA. You can also set up notifications on recalls for you TV or MH.

Frank & Brenda
TT- 2015 Coachmen Freedom Express 248RBS 50th Anniversary
TV- 2010 Suzuki Equator RMZ4
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