I converted my 74' Plymouth Valiant to a camper. Took the back seat out and had my feet in the trunk. Had a foam mattress and hooked up a choke cable to pop the trunk if I had to get out fast. Used it once, and am damn lucky I wasn't killed. The plan was to sleep in it while holed up at ski hills. First and last time I tried it was at Mont Tremblant, Quebec. Probably the coldest ski hill on Earth. It was at least minus 25C out. I had a small propane heater and a good sleeping bag. As I bunked down, I was wondering if I was falling asleep or succumbing to fumes. Woke up around 4 AM with the heater running out of propane. When the sun finally came up, the whole car was covered with Ice inside. Solid frost and ice on every surface. I made toast on the propane burner and sat in the restaurant in a stupor once it opened. Wonder what fun was had in that E30?