Jim,
Here is a reputable camper manufacturer [1] that would be able to put together a less expensive camper than the $200,000(!) Earthroamer XV Diesel Off-Road RV [2]. Though the Earthroamer is an outstanding vehicle, I believe these [Callen Campers] are more in the price range that we all expect. Notice they will custom make off road campers. witness the pics on home page. I used to see these around Southern California quite frequently. They make nice gear. Thanks, – Jason