Since car tire repairs run 15 dollars/plug, I figured truck tires are like 20 or more. So I bought a tire-repair kit and recently had a nail in one the tires of the D-250. Unlike smaller trucks, these truck tires are thick and it was impossible to drive the T-bar hole-primer through the radial lining. S I got an electric drill, put a small drill bit in it, and drilled the hole out carefully. Then primed it with the tool, and stuck the plug in it. Voila!