another suggestion, rear bumpers must stick out past the rear tire by at least 3".
If a front bumper is present, it must stick out past front tire at least 3"
in a nerfing situation, if tires touch it causes broken parts. We noticed at the baja 1000 while in line at contingency, Jagged X car rolled up behind our car, and their front tires touched our rear tires and the bumpers were not touching.