I have an AWD Subaru and once stopped at Chinquapin by a control spot to put chains on. I thought it was pain but hey, rules are rules. So I climb out to put on chains and a ranger comes up to me and says very politely, "Sir, in your car, don't worry about it. You can go on ahead."
Last winter, up at Big Bear, I stopped at a similar chain stop. They noticed that my car has mud and snow tires (M + S) and told me not to worry about it.