P255/75 R15 Michelins on a 2001 Chevy Express 1500 Passemger Van. My apologies, that would have been very helpful information for me to have given in the beginning. We're traveling light this trip with just DW, myself, our 8lb k9', two bicycles in the van. The TT is a 26ft Keystone Passpprt Elite ultra lite fully loaded and weighing in at 5200lbs. Actual weight according to the scales at our local garbage dump which weighs trailers as a public service. Everyone is being so helpful. I get way more info here than at the tire store.
I digress so easily..... P255/75 R15 what do I set the rear tire pressure at? I've always used 35psi but I'm looking for the optimum.