For me the solution to the question of tire air pressure was to use the temperature gun I had bought for another issue. My small 16' Cresty lives on trailer tires that suggest 50 psi for a max. pressure. My experience is even with the small boat and trailer (1200 #'s on a scale) if the pressure in the tires goes below about 45 psi the tires will heat up quite a bit. 50 psi and they heat up but not to the extent of 45 psi. I also check the car tires on the Sequoia and they also like to run cooler at the max. air pressure Toyota and tire manufacture (Hankook) suggest (33 and 35 psi). The temp gun also comes handy to check the trailer bearing temperature. I also bought a tire tread depth gauge and check the tread profile across the tire face. Running at max. pressure has had no effect on that.
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