Keep in mind...just because it has the most (claimed) suspension travel, that doesn't mean it will ride the best or handle the best either. You have to take into factor the car's weight and wheel base too. Those cars do great, but I think for the money a 2 seater like my car (Short Sand Car) or other mini is the way to go.
Also: I don't think you'll be able to really USE one of these cars on a "4 wheeler trail". They are just too damn fast and I could see them gettin squirly as hell in the dirt.