I installed a 1" body lift from ORD, and new tires on my 1985 K30 Duallie. The tires are 255/85/16 (33" diameter) A/T tires. I got all (Qty.6) of them for $680 (including shipping) from this company http://www.nebraskatire.com/. There was a small problem with the tires, but they cleared the problem up right away by crediting $50 back to my credit card and everything was cool. I also installed a set of Centramatic balancers on the truck too (cost $370 with shipping) http://www.centramatic.com/. A set of 1/4" spacers where installed between the rear tires, in order to make sure the over sized tires would not rub against each others side wall. I got them from this E-bay seller http://cgi.ebay.com/ebaymotors/ws/e...ry=42614&item=7968123621&rd=1&ssPageName=WDVW I think (for now) this is as high as I am going to go with this truck.