That was my thoughts too.
First of all, just how much un forseen damage could be done to car tyres and suspension.
Secondly, how many site owners would have heart failure if they saw you churning up their grass.
These might be fine at an auto grass meet, but on a pristeignly pruned and mown site, I think an argument and even private prosecution might ensue.
I have threaded 8mm rope through the spokes of the alloy wheels on my car, which afforded very good grip on a muddy field with minimal distruction to the grass. But even doing thta has problems, as you have to jack up the car to do it, and spin the wheel by hand to ensure nothing is catching. Then of coarse you have to cut the cord off agin before you hit the highway.
Best policy is not to pitch where you can't get to or away from without assistance. Or if you do get stuck as the site owner to use his tractor before you churn up his grass. The are much more apreciative of people who care about their site and will tow you for free.
steve L.