I can't find the name right now, but there was a company outside of Denver - maybe Littleton or Parker - that was making vehicles like this in the 60s. They'd find whatever vehicle they could get their hands on for cheap with a wrecked back half, cut the back off, and then build a camper on the back - old Cadillacs, Mercurys, Pontiacs, etc. It was a husband and wife team and they had a business name, but for all intents and purposes these were "homemade" and uniquely built depending on the chassis. They weren't around long and built around 50 of those things. Ring any bells?