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It says on tires what the manufacture recemends at a certain load but I just fill mine up till they look good and all the tread is in contact. I fill my tires to the recemended psi when towing heavy stuff. 40 psi should be good as long as the whole width of the tread is contacting. If you want you can either put a piece of paper down and drive over it or wet your tires and drive a few feet to see exact contact patch.