Got for it!
But here's my take on that (have thought about it before)-
The ends on your shocks aren't made to support weight.
Neither is the shock shaft (too small)
The valving of the shocks is most likely way off.
It works better for the car apps it became popular on, because their struts are already (technically) a "coil-over"... just not an adjustable one, but everything is made to be weight bearing... Alot of circle track shocks are, too.. just add the threads.
The H&R/Bilstein coil-over system I had (on a car) worked incredibly well, because they are made to work together as a system.. It's why the addition of those automatically put me in another class for SCCA events.
Personally, I plan on air shocks in the future.. I just don't need that last 5% of performance and the less stiction the coil-over system gives, for usually ~double the price.