Tire fitment question

[tulipvendor50]

Don stated:
"Alcoa documents list 8.25-inch rims variously as 7400 lbs"

Bill:
There is a coach right next to me with 8.25 inch rims and it clearly states
"7000lbs"

Don stated:
"As far as the fenders I had the older rubber ones, and the tires would hit when
dumped-while-turned even with 12R - the extra half-inch of tread on the 315 made
no difference. I did NOT put 315s on the drivers because of the potential
rubbing issues. Those that have done so (Shane comes to mind) run their drivers
at higher pressure than needed for the load, which negates the ride improvement.
"

Bill:
I run my tires at 110lbs pressure and have had no problem with the rubbing. I
doubt very much if one could really feel the difference in ride with the higher
or lower pressure.