If you don't want to be tied to your truck, you can make the equivalent of an AB Vagabond with greater capacity for less money. There has been a long, on again, off again thread on the specifics on dpreview since last year:
http://forums.dpreview.com/forums/re...ssage=21173329
You just need a 12V lead acid battery of whatever capacity you feel is appropriate for your needs, an inverter and something to put it all in.