I made this set up over 10 years ago.......
Portable air tank held in with ratchet strap on factory spare tire mounts, I would use the cheapie 150 psi plastic 20 dollar compressors and gut them, mount to the handle with large hose clamps and plumb with brass fittings keeping the tank pressure relief valve system intact..... it would take foreever to fill tank, but once filled at 100 psi you could fill up 4x 31 inch tires from 18 to 32 psi pretty quick, just used the cig lighter plug and cord that came with the plastic cheap compressors........Later I added the Quick Air 2 and plate to tank handle to mount it,I got it in a trade and works on 35's better I have been running awhile...... Fused and hard wired from the battery and switch and relay on the compressor itself..........
The old Quick Air 2 is giving up the ghost, took it apart and has armature problems..... Oh well, cant get parts, long out of business........
Its all about price how fast you want to air up, VAIR is what my buddies use on thier bagged show trucks, and those pump some air, but 300 bucks plus for a compressor depending on size.... I am a cheap , so most likely gonna get the largest Harbor Frieght 12 volt compressor with my 20% off coupon would be 44 bucks plus tax and another 5 bucks for extended warranty, it wont be fast, but it will do what its supposed to for cheap, just cant let it over duty cycle to long., wont mod it so it cant be put back to stock for warranty purposes and mount where the Quick Air 2 is.... If you use air all the time, get a good compressor, I dont use or air down much these days, more for piece of mind.........
Even the large HF compressor will peak a good 30 amps when it starts, need to not skimp on wiring like I did, I am using a wire harness out of a wheel chair lift set up for a van I pulled years ago,needs to be larger wire, another to do on my list to upgrade wiring to the new compressor I get, at least 8gauge but 4 gauge would be better........
Also CO2 is great for airing up tires, my buddie runs a paintball field and made an adaptor for standard paintball tank threads from an inexpensive fill station and some brass fittings..... a 20 OZ CO2 paintball tank will fill a few flat tires... I was amazed, he uses it on all the flat tires on the field cars........Full Paintball CO2 tanks are even at Walmart now last few years......