I've heard various urban legends about people using the small Diesels from reefer units to power compact trucks. They're very long lasting and have huge oil pans, the downside is they aren't equipped for variable-speed operation (plus the issues with the bellhousing).
I'd try it if I had an old Hilux or something. Just for kicks.
I put the thermostat in backwards like an idiot and the engine got so hot I think the needle on the temperature gauge actually bent. Flipped the thermostat and she's still going with no worries. Does that qualify as a horror story?