Did GM ever make a 15" 8 lug rim? If not, what's the tallest tire I could fit on a factory 16x6.5" steel rim? The best I could find is 255/85R16. This is going on my bush truck and I would really like to keep the steel rims but still go as big as I can on that. My point about the 15" rims was if I could find a set, I would just get some BFG 35's and call it a day. Also, wheel spacers...are they safe to use on a 4x4? I keep imagining they would cause some problems. Reason I ask is because I do have a set of aftermarket 15" aluminum rims, but the offset would definitely require that I use spacers to fit them on the truck. This is a last resort though.