I just did a 4,000-mile trip across the Southwest and ran these exact air pressures (50 in the front and 60 in the rear). The van handled like a dream, with almost no road noise (silky smooth) on good roads, but with the expected chatter on bad roads/ gravel roads. Averaged 19.5 MPG with RWD V6 semi built, but pretty loaded van (not sure of total weight but guessing under 8,000 lbs).For at least ten years I have been running my 8100 lb. van at 50 front, 60 rear, to no excessive visible tire wear across the tread.
Note that these “comfort” tables are based on 15” rims, but yeah… you won’t always need 80 psi to be safe.Tire pressure threads.
Tire pressures should always be based on actual, current, weight.Did you ever find a good explanation why the front pressure is increase from 55 to 80 psi just because of RV conversion, since chasis weight rating should not have changed