Back in the parts house days Dad had a 78 Sierra long bed that was the shop truck. After it got fixed from the wreck when it was just under a year old, he decided to trick it out some. Got a set of the factory wagon wheels that were 15x8 and put Goodyear GTRadials on it, white outline letters, LR60/15. Dropped it like 3 or 4 inches, sat beautifully, looked cool with the wheels, bumpers and mirrors color matching the Colonial Yellow paint. That was a badass truck, we also put headers on it and duals with Walker blue glasspacks. Sounded like it had a cam in it but fully stock internally. I think in modern tire sizes that is equivalent to 275/55.....It also made a nice step to swing myself up into the bed from the side. And no tire rub issue, just had to change the speedometer gear. Square body trucks were just a little easier to do some stuff on......