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Old 09-26-2017, 10:07 PM   #3
busterbrown
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Join Date: Feb 2016
Location: SE Michigan
Posts: 1,659
Your tires, if the original set on that trailer, were probably in their 6th year of service, without any record of use, abuse, or maintenance. Towmax, Trailer Kings, and many other OEM ST tire brands have very poor ratings, especially when age exceeds the service life of 5 years. Many recommend replacement tires within 3-5 years of the DOT date stamped on the side wall of the tire.

Respected brands going forward include Carlisle (Radial Trail HD), Goodyear (Endurance), Sailun, and the forementioned Goodyear G614.

A good rule of thumb is to have adequate load reserve capacity with your new tire selection. If degradation of a tire annually is accepted at 10%, do the arithmetic to see where you need to be for safe towing in 3 to 5 years. Your total trailer axle weight (when loaded) divided by the number of tires will give you a load reserve capacity of 0. Use that number to work backwards in order to determine what load rating is acceptable for your coach.

Good luck.
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