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Old 10-01-2013, 07:01 PM   #15
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Originally Posted by elkhornsun View Post
I have two friends who have both put thousands of miles towing 13,000 to 14,000 lb 5th-wheels using 3/4 ton diesel powered pickups with no problems at all. The DRW trucks get away with lower load range tires as there are 4 taking the place of 2.

Not at all difficult to find tires for 17 and 18 inch rims that provide 3750@80 PSI of load capacity of 7500 lbs. for the pair at the rear axle. Subtract the weight of the empty truck measured at a local scale and you will have the load that the tires can handle.

People mistakenly think that the load limit of the rear axle is based on the axle and its wheel bearings and it is not true with trucks. The limit is based on the weakest link when the truck left the factory and with the 3/4 ton trucks it is the tires and the rear leaf sprigs. Tires can be changed and helper springs can be added.

With my 2500HD the trailer weight would need to be over 16,000 lbs. to exceed the capacity of the rear axle, bearings, rims, tires, and springs, based on the modifications I have made.

If when traveling down the highways you check the number of 5th-wheel travel trailers being pulled by a SRW or DRW trailer you will find that more than 80% of the time they are being towed by a SRW truck.

What is very helpul in terms of ride comfort is a shock absorbing kingpin like the ones from TrailAir. Regardless fo the truck they help dampen the movement of the trailer and improve ride comfort for the driver and any passengers.
Totally agree with my 15000 trailer towed with my 2005 F250, for past 5 years. Not all 15000 trailers tow equally though. 7k axles are also required on the RV. And my SRW truck rides well and much better then any dually pulling my unit.
Driving in on an exit to a rest area I hit a huge pothole with my rear truck wheel in order to save the trailer wheels hitting it. Parked and noticed a U-Haul truck siting there with a flat and a bent wheel. The driver felt awfull bad as he said but I am not loaded heavy. I told him not to worry there was less then 80 psi in the rest of the tires and I made sure the service man added proper inflation. As I found out later, no one drive those trucks with full 80lbs because they ride to rough and U-haul has an awful time keeping full tire pressure and also includes most my friends with duellies. IMO properly inflated SRW tires are much safe the major of light loaded duelly tires that cannot hold the load if exposed to single tire loads.
At work I had to replace all duals on our heavy trailers due to constant flat tires that were caused by improper loading on rough terrain. The solution was the available super singles that actually outlasted the previous tires to the point that we never had any loading terrain issues.

Barbara and Laurent, Hartland Big Country 3500RL. 39 ft long and 15500 GVW.
2005 Ford F250 SD, XL F250 4x4, Long Box, 6.0L Diesel, 6 Speed Stick, Hypertech Max Energy for Fuel mileage of 21 MPusG empty, 12.6 MPusG pulling the BC. ScangaugeII for display..
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