I suspect cost is the biggest issue. There just aren't enough people that would hand over $60,000+ for a 8X10 ft box that can be put in the back of your truck. Add to that the $50,000+ truck it takes to haul it for a total of $110,000 and my desire to take it out into the boonies to get scratched up and bent has greatly diminished. If you can afford that you should be looking at a 4X4 class C to get more room (like the one Host builds) for less $$$. I also doubt there are enough buyers in this market to make it worthwhile for a manufacturer to pursue.