Search the homebrew forums. You can make a much nicer kegerator much cheaper than the store bought ones. I have a full size that holds 6 five gallon kegs. Unfortunately, it's not in the HTT. 5L kegs would work well in the camper refer;

Another thing people often forget is that beer does not have to be stored cold (just not hot), you can chill it right before you serve it. This lends itself to camping because you can just build a jockey box like this;
http://www.homebrewtalk.com/f51/nano-jockey-box-176942/