I think I might go this route.
Compressor
ViAir 88P compressorIf you look at the specs. listed at the link above, you will see that the 88P compressor puts out 1.98 CFM with a 45% duty cycle. That's not bad at all.
Tank
5 gal. air tank With the output of the pump, a 5 gal. tank should be fine.
My plan is to strap the tank to the chassis, then add a remote drain and connection port. I also want access to the compressor in case I need to use it for an emergency or pull it for service. I think a good option is to put the drain and connection port on the rear bumper and put the compressor inside the rear storage compartment. That puts it right next to the genny, with a great 12V feed and there would be room for the hoses and fittings too.
Jose