I asked a similar question a while back and the suggestion I got was to use a gas powered compressor. Only problem is I use a van and didn't want to deal with exhaust fumes, so here's what I ended up using. It's a 2hp 8 gallon compressor off of an inverter. I run air tools off of it without any issues. I also have a 5 gallon aux. tank for my air horn
. As you can see I mounted 12v and 120v receptacles at the side and rear of the van as well, and it's all tied in.