I'd like to see:
Automatic jacks that will allow the car to be raised and lowered for maintenance and can also be deployed quickly allowing the car to jump over obstacles.
Special grip tire treads that deploy from a compartment in the wheel well and cover the existing rubber lending tank tread-like traction in mud/snow/vertical driving situations.
A bullet-proof/crash-proof passenger compartment that can be sealed air/water tight and that is supplied with about an hours worth of supplemental oxygen. This will allow the occupants to survive serious wipe-outs, thwart gunfire, and drive underwater. Throw in a periscope, too.
Special headlights that improve vision at night, in storms, and under water.
Giant circular saw blades that deploy from the front of the car, allowing a driving path to be cleared through woods and/or brush during an off-road/off-track excursion.
A small, flying vehicle that can be launched from the vehicle and flown via remote control. The vehicle, no larger than a sheet of paper, can be equipped with various surveillanceand/or messaging equipment. With the touch of a button, the unit can be sent 'home' with a message, if needed.
And for those rare instances when one needs to clear obstacles with some distance, tiny wings that deploy from the underside of the car on each side, allowing the car to gain a little lift when jumping over obstacles, thus allowing for a greater distance to be covered during the jump.