Hey Kool, You've got 10.00X20's on that 350 COE of yours. WOW !, That 'ol boy's sitting high. I was thinking about putting 10.00X20's on my 450 COE, but I don't think my Holmes W45 Wrecker rear fenders, will clear them. You're cutting yourself short, on the gvw. That 350 series of yours, is a 2 ton. 300 series GMC's, were 1 1/2 ton rated.