<p><b>IN</b> Hydraulic rams for adjusting ride height. They allow you to raise or lower each wheel individually, generally up to 17 inches. This is the hot ticket for keeping your rig level in really off-camber situations or merely lifting a tire to throw a rock under. Airbags, while not able to lift the tire, can be useful in leveling vehicles in tilted sections and are a whole lot cheaper than hydraulics. <p><b>OUT</b> Since the hydraulic rams don’t compress the way a regular shock absorber would, your tires effectively become the shock absorber. Ever seen a lowrider cruising down the street? Or how about an early ’80s Honda three-wheeler? Boing!