The project to clean-up to the Water-system in September 2020 unlocked easier access to the little cubby in the right-rear corner where the factory scissor jack originally stowed, and I wanted to use that space to mount the compressor. It's out of the dust and moisture, but also out of the way, and if I leave the factory jack cover off, there's more than enough ventilation.
Popping out the little "oddments tray" at the top of the trim panel also gives easy access to the area from above, making it relatively easy to service things, once I'd rerouted the factory wire harness that normally clips to the outside panel:
|OEM tire-jack cubby, from above|
As I said, ventilation in that area is pretty good, but I saw that Viair offers a mounting kit that includes a pancake fan to help keep the motor cool. I thought that was a good enough idea to adapt (steal) for myself, so I added a surplus 12v PC fan and a little aluminum bracket:
|12v PC fan to keep compressor motor cooler|
Next I needed a little control and mounting panel for my air chuck:
|Enable switch and panel-mount for the air chuck|
|Lonely blue wire to the rear cubby, courtesy of the General|
That wire was convenient for signal, but despite the 20A rating in the factory wiring diagram, it looked a little thin to power the compressor. I ran a separate power cable for the relay to the compressor directly from my accessory fuse block.
I am THRILLED with how much faster it is to air up at the end of the trail. Previously, about half the time spent on airing-up was to unlock the rear cargo box, unpack the portable compressor from the bag, pop the hood and connect the power clips to the battery, etc. etc. etc. Now I can just open the rear doors, plug in the air hose, flip the switch, and I'm filling. The auto-shut-off also means I can spend that fill time walking around and looking for problems, instead of watching the gauge.