You can hop and 3 wheel on air, i have an air ride system & my air pump runs off the engine, to hop on air you need double port bags and 16 valves, both air and hydros have there pros and cons
Bags give you a much nicer ride and you save a lot of weight from not having to need the batteries. Plus air bags are just plain cooler to have and hear the "psshhhh" when you slam it parked.