I prefer the roads too. Check these videos out.
http://www.rickskraschsite.com/galle...Video=0&Page=0
The car screams and handles great on the roads. Tight, rocky, whooped out or sand.
It can do all at very high speed. I'm sure the semi trailing arms would be fine too. But your last car was a sidewinder. It's suspension is nothing like the AR51. Build it to the plans and you won't be disappointed.