I should try the lower tire pressure on my dinosaur F250. I run 80 rear 50 front as door placard says. Ride empty is terrible, makes Lisa ill after a few rough roads. I did put 350 rear leafs on it years ago - my 220 lbs can jump up and down on rear bumper and it won’t move 1/2”. I may try 50#’s in rears. It does pull 12K occasionally so that’s why rears are at 80.