When I had my 1981 K10 Chevy PU, I bought it with 31 x 10.5/ 15 All-terrain tires on it. When those tires wore out, I went up to 33's. With the 33's, I had to trim a little of the rear of the front fenders. I also had 3/4 springs on this truck, so it seemed to sit a little higher that a stock 1/2 ton.
Bill
1996 K2500 Suburban - Purchased in Sept. 2002 - 297K miles
Only mods - K&N filter, Greg's Oil Cooler Lines, Home-made FSD heatsink, Kennedy quick heat glow plugs, LED interior lights, Kenwood stereo, 2001 GMC aluminum rims. AutoMeter Guages (boost, EGT, TransTemp)
2007 GMC Acadia SLE - wifes car.
1987 Buick GN totally stock - 48K miles