[Run to Rund]

First, never underinflate trailer tires in an attempt to "match" their weight capacity to a load on them that is less than their max rating. E-rated tires take up to 80 psi and don't run less than about 75 even if the trailer is light. Second, it is best if they are loaded not over about 80% of max, especially if you want to run about 72 mph across the big western states where 75 mph is the speed limit. Third, if there is any chance the trailer weight is near the max for the tires, weigh each wheel's load to be sure the weight is evenly distributed and no tire is overloaded.

When we get info about problems with 15" that were "solved" with 16" truck tires, sometimes it is caused by bad 15" trailer tires, especially Chinese made tires. Sometimes it is caused by high highway speeds on overloaded tires, and the 16" tire had a higher weight capacity and is more forgiving of 75-80 mph in hot weather. It is very easy to load a lot of stuff into the trailer that doesn't seem so heavy on an item-by-item basis, but in aggregate was too much.