I just got my NP203 twin stick ordered from ORD, and this time next month I'll be ordering a 4" suspension lift (not sure where or what brand yet), and then by late June I'll have all 4 tires. However, due to financial constraints, I can only buy one tire at a time..... I had a set of Cavalier Mud King XT 31x9.50x15 on my old Jeep YJ and I liked them. I haven't been able to find anywhere locally that still carries them, but I'm also not too sure if my K10 will fare as well with the same tire (Mud Kings..not the 31's). So, for your consideration, I offer the choices I have narrowed down to. Vehicle: 1979 K10 (will have a 4" suspension lift prior to installing tires). 15x10 rims with 4" backspacing. Usage: Vehicle is not a daily driver, so pavement time will likely be limited to driving to wheeling spots and rarely trips around town. While offroad, most of the terrain the truck will see is sand/dirt/small rocks. Mud on rare occassions and rockcrawling rarely as well. So I guess it breaks down to this: 15% pavement 65% sand/dirt/small rocks 15% mud 5% large rocks/rockcrawling.