if your wing has an onboard compressor all you need is the hose but i've heard it is time consuming. there is a slime air compressor for motorcycles ( about $ 15 ) which is svry small and then there is a mini slime compressor for cages ( about $ 20 ) not much bigger than the m/c compressor. autozone carries them
Installed a 12v outlet in the trunk and found a portable, albeit large compared to the Slime, compressor at the shop. It's a rather small addition ,but it sure has changed the way I keep up with the tire pressure, and it is saving me bundles at the pay-per-air pumps.