Hey, smokinjoe. Greetings. I believe that 30"/31" tires like you desire will fit under your truck, especially with a slight lift. Does your truck have six-lug hubs? If so, you could use the factory four-wheel-drive wheels (15"x8") from a newer K5 Blazer and they'll fill your wheelwells with those fat tires easy! Nothin' like a truck with fat tires, IMHO
Regards,
Wannabe
