Lack of understanding of physics always amazes me. Why do people strap to sprung attachment points without fully compressing the suspension on driven wheels just boggles my mind.
Especially in RWD, enclosed axle configurations, it should be trivial to keep the tires hooked up by using tie downs on the diff and axles themselves like
this car was
Yes, you need to keep the chassis as a whole from moving as any video search of dyno accident will show, but downforce on the tires should be done with straps, not putting people's lives in jeopardy...
This was almost fun....
http://www.youtube.com/watch?v=oGaXtdW_NNo