I was looking at one of these. They only draw 45amps and can fill a 5 gallon air tank in less than 2 mins. My air gauge never gets above 110psi on the truck with the drive pump now. I hardly even have to use my brakes on the truck anyways cause they jerk so hard.
http://www.pacbrake.com/index.php?page=onboard-air-accessories
Can you use an electric compressor for brakes?
I've got a 100%duty cycle viair 450c compressor that I run my auto leveling air suspension setup on that I got from Hornblasters.com. they have all kinds of interesting elecrtic compressors going all the way up to the silly big