I've been considering picking up an old military Land Rover to convert into a fun off-roader/weekend vehicle/overnighter. East Coast Rovers builds amazing custom expadition trucks but they are big money, I'm on a smaller budget. I really like the Land Rover Series III 109" trucks. Keep the back empty to use as a "pickup" most of the time and throw a mattress in there for camping trips. An ex-ambulance or Forward-Control would be even better camper, but on the big side for off roading and road driving.
LR Series III 109"
LR Forward Control
Then today I ran across this ex-military UniMog 404 Radio truck. COOL! http://cgi.ebay.com/ebaymotors/aw-cgi/eBayISAPI.dll?ViewItem&item=601449908
Check out this one that's been camper converted. http://homepage.tinet.ie/~jconsidi/Camper.htm
Ultimately, a refurbished Land Rover Series III 109" ex-military truck would be the best comprimise for me. They can be made to be reasonably comfortable for the occasional road trip, are super-tough off road, and the back box gives a lot of flexibility. I am strongly considering one. I hope to check out a few at the "The Fiddleheads & 4x4s Festival" in Maine in May.
Anyone else ever done something like this?