I've been debating what I want to do for air as well. Main use will be to air the truck's tires back up after a trail or for misc things while out camping (bike tires, mattress, water inflatables/toys, etc.)
Was originally going to go for a mounted option like ARB, etc but then I got to thinking...  I have the 2kw Pro Power and it would seem smart(er) to use some type of compact air compressor via an extension cord. I wouldn't have to deal with long air hoses, mounting, and it could serve different needs with one piece of equipment. Added benefit of course is with the extension cord (that is always in the truck) I have a lot more flexibility in where and how I use the compressor, when I am done with it goes back into the Decked drawers.
Anyone already done or have thoughts / recommendations?