I posted this on Dingo's build page, but thought it might add to this discussion:
The one issue I was still facing was trying to re-inflate tires in a more rapid fashion in between trails. I could have purchased the VIAIR kit, but instead pieced together my own, which fits great in the space where my spare used to live.
I used the Viair 400C compressor and initially a Firestone 1 gal tank someone gave me. Realized quickly that I needed more compressed air storage and found the Firestone 3 gallon tank on Amazon. So now I have 4 gallons of air and tested the system. Went from 20 lbs to 44 lbs in under a minute per tire. Also picked up a Viair kit that has a flexible air line and I can reach all the way around Dingo and trailer from one air chuck in the rear bumper. Cheers
http://www.amazon.com/Viair-00044-D...8-2&keywords=viair+digital+tire+inflation+gun