The X848 will allow you to reach the trickiest peaks (keyboard friendly).
Like an explorer vehicle its suspension has not been setup for high speed.

Group 1: engine 1 (175hp), 6WD.
Group 2: engine 2 (125hp), +2WD.
Group 3: rear-steering wheels, for higher maneuverability.
Group 4: middle-steering wheels, extreme maneuverability.
Group 5: "roll-over system" (vtol+trim+yaw - to expand the pistons-). You could put your vehicle in the right way..., also you can destroy it XD.
Group 6: doors (vtol). They are always open at the start :S.
Group 7: parachutes.
Group 8: lights.

I think I got lost through the variants..., you might add around 500 lbs of dead weight to the front getting better stability and handling. Enjoy!