A couple years ago while on the set of Public Enemies, we were out at Stateville prision in Joliet IL and we were up early, like 4am, and me and mornings have been bitter enemies for years. So, the sun came up and we weren't needed for a couple hours so I stretched out on the front seat of my truck, head against the driver's door and my feet hanging out the open side door. I had on sandals. A couple hours later I woke up with a very bad burn on my feet. So, yes, I've slept in my truck, it was comfortable, walking around in badly scorched feet for the next few days was not.
-Tim