I'm driving a 1/2 ton with 3/4 ton tires on it. The side or max inflation on the side wall is 80lbs but they currently are at 50lbs and are working well. The ride is still rougher then the original tires and they have little or no squat to them even with the rear well loaded and sagging. Now on the trailer that I most often pull they have 45 on on the side and I found them to be the best at 60lbs otherwise when fully loaded try and keep it on the road at 65. I also have raised the hitch point to the truck to improve the tow. It is all different for every application. My boat trailer is built for a heavier boat and on thse I run them about 15lbs below the max on the sidewall and it tows great at any speed that I've towed it.

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