When we rented a U-Haul truck last summer, I bought one of their heavy duty locks. I don't remember how much it cost, but it was a nit compared to the cost of the truck and gas. I still have it. Easier to hang onto it than to get rid of it. I could throw it away, but only theoretically. I would not be able to actually do it. Acquisition is too deeply ingrained. Could it be that I have some Ferengi blood?