Oh man, I was doin that in my 92 Mercury Sable about a year ago. That was fun. We used jack in the box trays the first time(a friend worked there), then when they burnt through we went on a mission to find something better. One time we foound a place where someone dumped some **** and picked up an old satellite dish. Later we saw an ironing board in a field. So we picked up both and eventually burnt through both, but it was fun as hell though while they lasted.
So a few months later I bought my Z28 to do donuts without trays