Me when racing. I always check my wheel nuts. Make sure they are tight and secure. I had too many wheel nut backing off and the tire going flying in the air, too many times. Instead of using loctite around the wheel hex and stub axle, I use some red n tacky grease, and also too free up the hex if its binding or doo tight. (Check B74.1D 2.0 Build thread for that issue/s)
Obviously for a crawler, you don't need that. As your going slow. Not like your wheels are moving at the high RPMs of a powerful 13.5 motor.