We do the exact same thing (www.michianarc.com
) although we run them at the same time as the onroad guys. We get a crowd of about 50-60 every friday night. some guys run both road course and offroad. Our track, it only takes about 2 minutes to pull the plow disks and ramps off the track.
Carpet..yes, we have a few holes, but this year we will be putting a tall nap carpet carpet behind ALL the jumps and under the plow disks to deter this from happening. It is also important to have say "tech" to look over people's cars from time to time to check for "loose screws". We've found they are usually the culprit of holes in the capret.
Check out this video....