I don't see anything wrong with taking essentially a truggy and slapping on big wheels/tires and beefier body/bumpers/cage. It's awesome!

As cheap as 6s 1/8 electronics can be had these days it makes the decision about what truck to go with the hard part...I'd toss this http://www.ebay.com/itm/Arrma-BLX185...cAAOSwA3dYFCda in it since I'd be broke after buying the roller from Serpent lol

Hard for me to imagine RC "monster truck" racing at the pro level - since truggy is pretty much that...except for the soild axle MT crowd that runs sanctioned events worldwide but that is a whole nother ballgame.