I have picked up the dual compressor from Smittybilt & love it. Here is a link to it.
http://www.4wheelparts.com/Towing-an...&t_pn=S%2fBQ89

Part Number: S/BQ89
Dual Cylinder Compressor
Easy twist screw on brass inflator top
Quick release 16-foot coil hose
Auto-thermal cutoff switch
Built-on cleanable airfilter
Storage bag included
Integrated 150 PSI - Easy to read pressure gauge
3.17 CFM


It connects to my battery via battery clamps like jumper cables & very happy with it