It has an onboard air setup (see box on the front). That draws trailer power 12V from the tow rig, electric compressor fills the tank up. You could also add to the setup a Schrader valve and check valve and fill from any compressor or gas station as well. Pretty similar to RideTech air ride stuff.

I have helped a serious amount of customers load and unload their cars through the years and a winch with the remote is the best way still to do it IMO. Nothing wrong with being able to put a hook somewhere an doing it your self without help