I did that also. Started at 80 pounds then went to the Thor's recommendation of 90 pounds. As I said the right front tire was totally gone at 13,000 miles from not being aligned properly and the left one was almost there with definite signs of under inflation. The tire shop said for the 19.5" tires you need to be over 100 pounds. Running mine at 110 now (maximum pressure for the tire is 120 pounds) and the motorhome drives down the road like a different unit.
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