If you dispense on the road a lot, you can look at something like this. http://www.google.com/m/products?oe=UTF-8&client=safari&q=Cornelius+Keg+Portable+Co2+Charger&hl=en&source=gp2&channel=products&ei=XDHGTLj4M6S_tgevt-ezAQ&ved=0CBgQzQM
It's not as good as rolling trash can kegerator, but its...