This cot, from the early 1960s, was designed for low-headroom vehicles such as station wagons, combinations, and lowtop ambulances. It will need a correct mattress:
http://www.ebay.com/itm/Vtg-EMT-Amb...339678?hash=item51ea8b299e:g:kMsAAOSwgmJXyYy9
http://www.ebay.com/itm/Vtg-EMT-Amb...339678?hash=item51ea8b299e:g:kMsAAOSwgmJXyYy9