revo=probably one of the worse things to try to make a crawler with. For one thing, nitro is the worst for crawling. second, with the way the shocks are set up, its difficult to get a big amount of travel. Basically, its just not a crawler, but you can still run over some stuff with it.
if you wanted to make an actual "crawler", you'd be better off getting a tlt or jugg or something like that.