Looking for room in the belly and decided the 5-gal pancake compressor needed to stay home. Too heavy and too fat. I replaced it with this 2-gal from Harbor Freight (Central Pneumatic 47407). The picture is deceiving, it really is a small compressor. Not much bigger than the 12V system.
I chose 110VAC because we have an onboard generator. A little disappointed in recovery time, but it is super quiet. I was shocked and may be inclined to permanently mount it in the forward compartment if I can find room, and add a hose reel. It has it's own cooling fan that comes on whenever the compressor is on.
$59. As cheap as any I was considering.