Originally Posted by llberge
....Everything that I have read says that installing E range tires and under inflating them to 65psi will cause more problems than it would solve. Trailer tires are designed to be run at max inflation or you will get heat build up.
Not sure I agree with this statement. It would be helpful if you could direct me to where this info came from.
In reality (check the load range charts) an ST "E" rated tire inflated to 65 psi is a "D" rated tire and it can carry the corresponding load. The "D" range tire is more than adequate to carry the load for current Rockwood/Flagstaff ultralight RV's. Don't forget to subtract the pin weight when you are calculating axle or tire load. Excessive heat in a tire is caused by overloading or underflating and not by airing up to the appropriate load that the tire is actually carrying.
When I had the factory "C" rated tires on I carried the max allowed which was 50 psi. Now that I have ST Maxxis 8008 load range "D" on I carry the max permissible both specified by the tire and the wheel supplier which is 65 psi. I contacted Maxxis prior to buying the "D" rated tires. They said there was no benefit in going to the "E" rated tires as I was limited by the wheel to 65 psi and my actual load on the axle and tires was below the "D" load range anyway.