I recently purchased this Craftsman portable compressor. http://www.sears.com/shc/s/p_10153_12605_00915309000P?blockNo=7&blockType=G7%2F&prdNo=7&i_cntr=1320369463181 Then I purchased a 1000 watt continuous/ 2000 watt peak inverter made by Vector. I connected the inverter to the battery with the short 6 gauge cables that came with it for a test run. The compressor took 800 watts to run according to the digital gauge on the side of the inverter. I mounted the inverter to the side of my subwoofer box and wired it to the existing distribution block using 4 gauge power cable. Under the hood I have a 100 amp Maxi fuse; I have another 100 amp fuse in the distribution block. I also ran a 4 gauge ground cable all the way back to the battery's negative terminal per the inverter manufacturers directions.
I have approximately $220 dollars in this onboard air system, not counting the dual amp wiring kit that I already had. It takes up a decent amount of space, but as the compressor is portable, it can be easily removed.
In my research I haven't seen an air system as simple, with the features that I have for the price. The compressor generates 2 SCFM@ 90psi and has a 1.5 gallon tank with pressure gauge, and an adjustable output pressure regulator with gauge. The compressor pressure switch is set for 85psi on 150psi off. The compressor came with a 25' coil air hose and a tire chuck; I added a T-fitting with a quick connector on either end at the output of the compressor for ease of use and future use with a locker.
In using a 120 volt AC current compressor, and running an inverter to power it I now also have two AC outlets in the back of my Liberty!

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Black '05 Renegade. Front suspension: Frankenlift, Moog HD LBJ's, Audiboy cut CV's
Rear suspension: OME 948's, 2 extra upper ISO's, Rancho RS 5000 shocks.
31X10.50X15 Duratrac's/ProComp 152's
ARB bumper, Mopar skids, JCR stage III's, Reese hitch with tractor lights, Champion shackle insert, "homebrew" on board air, 1000 watt inverter

So... what's the duty cycle of that compressor?

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2006 CRD http://www.UtahPowderCoatings.com/ http://www.gorecon.com/ I'm kind of a big deal.
RL rear bumper, ARB front bumper, Mile Marker winch, Power Tank, Skids by Mopar & Skid Row, RL Super Skink Sliders, 235/85R16 MTR, Air Flow Snorkel, DTT, 4.10 gears, Frankenlift II, Katskin leather, JL Audio stereo, Rosen video.

I’m smart enough to follow along, but I don’t have enough experience with onboard air to know what I’m doing. Do you have any pics? It sounds like you have a pretty nice system and well thought-out.

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2015 Ram Ecodiesel/Big Horn/4x4/Quad Cab
2016 Arctic Fox 22G/Onboard 2500 LP Cummins Onan Generator/160 Watt Solar Panel

I took the road less traveled. Now I'm LOST.

To JL: I didn't even think about checking the duty cycle of the compressor when I bought it. I can't believe I forgot to check that!!! I'm usually pretty good at keeping up with owners manuals, but I can't seem to be able to find the one for the compressor at the moment. I'll look around a bit and see if I can find a duty cycle...
To Diesel: I just finished putting this in the day before yesterday. I'll see about gettin' some pics.
Thanks for checking out my post

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Black '05 Renegade. Front suspension: Frankenlift, Moog HD LBJ's, Audiboy cut CV's
Rear suspension: OME 948's, 2 extra upper ISO's, Rancho RS 5000 shocks.
31X10.50X15 Duratrac's/ProComp 152's
ARB bumper, Mopar skids, JCR stage III's, Reese hitch with tractor lights, Champion shackle insert, "homebrew" on board air, 1000 watt inverter