I just bought this Master Flow battery-powered compressor and it works great:
Master Flow MF-1045. I also have two MF-1035's that I keep in our vehicles and they've always worked well (much better prices out there than MSRP BTW).
That said I also have a Craftsman C3 heavy duty impact wrench and wish I had thought to buy the compressor tool to go with it, looking at it I thought it was just for bike tires but now I see it's rated up to 200 psi, nice.
Craftsman C3 cordless inflator Thanks for the tip.
And if no one else is going to ask, Trailer pics please!!! I often frequent the rennlist trailer section, some amazing setups out there and sounds like you did some research putting yours together.