I own a Class A motorhome equipped with Goodyear 255/70R22.5 G670 RV Unisteel. Load Range H, radial tires. I weighed my loaded Coach on a CAT Scale with the following weights, Steer Axle 9080 lbs, Drive Axle 13080 lbs. The Owners Manual contains a Load Inflation Table
PSI 80 85 90 95 100 105 110 115 120
Single 4190 4370 4550 4675 4895 5065 5205 5400 5510(H)
Dual 3970 4110 4275 4410 4455 4610 4675 4915 5070(H)
As a new motorhome owner, I am unsure about the correct pressure for each tire. Using the weight for each axle and above referenced chart, the correct pressure for the steer axle would be (9080 divided by 2 = 4540 lbs per tire) 90 psi. The correct pressure for the drive axle would be (13080 divided by 2 = 6540, divided by 2 tires = 3270 lbs per tire) 80 psi. Intuitively, this doesn’t seem right.
Would you please enlighten me on this subject?
Thanks for your assistance.
