hmknightnc wrote:
...your tires are only rated at 3200# apiece meaning 12.8k# on the axles. I think a 40' Pinnacle loaded would wiegh considerable more than that. Just guessing but I think your tires are likely overloaded. ...
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If you look at this link, those exact tires have a weight rating of 3420lbs at 80psi ... so all 4 would be 13,680
Goodyear Marathon ST235/80R16 Load E specsIf you look at this link, it shows the current 40' pinnacle at a GVWR of 15,950 ... so if tongue weight is 10%, then (0.9) x 15,950 = 14,355 is on the axles, and your tires are overloaded by 5%
Pinnacle 40' specs.