John,
Sounds like a great plan. To see what others have done (for camping, not necessarily bugging out), check out the "Cargo Trailer Conversions" section of the Teardrops & Tiny Travel Trailers foru:
http://www.mikenchell.com/forums/viewforum.php?f=42&sid=767a2553eacb805903c3ced3f37ea7e0Lots of great ideas, design and craftsmanship.