I mounted my ARB twin compressor under the pax side roll cage using a Springtail Solutions MOLLE rack with the air output exiting via the US licence plate mount.
The Springtail rack is from Jeep Konnection and also doubles as a tie down point for my drawers and other bulky stuff in the rear when the drawers aren't in there.
It's now a simple matter of stop, flick the switch on the A pillar and go. No messing about with opening the bonnet, dragging out the compressor etc. My 35"s are inflated in under a minute each.