Where to mount Air Lift compressor on 07 Ram 2500?

I'd mount underhood. Some mount it behind the back seat.
In any case I wouldn't mount it under the truck where it's exposed to the weather.
Bet airlift install instruction have a suggested location?

I used their WirelessAir (P/N 72000) system on my 2500HD while I had those bags. Worked great. The compressor is large enough for the bags, but don't expect to run anything else off of it. I doubt the Ram is that much different, so check to see if you have room on the backside of one of the rear wheel wells facing the cab. Tons of room on my truck there, so that is where I chose to mount it. I removed the wheel well lining (replaced it after), drilled holes for bolts, fed them through the wheel well (tire side, under the bed), then mounted the compressor to them on the other side. Mounted the manifold right beside it. I was able to mount it high enough where it remained clean of road debris and muck no matter what I went through. I wouldn't mount it under the hood due to heat and didn't want to run air lines into the cab.