You could contact the GM Heritage Center, see if they are interested in having it in there museum. It would still belong to you, but it would be housed and cared for in the museum. Museums do that sort of thing a lot, usually there is a little sign that goes next to the item and somewhere on the sign it say something like "This piece on loan to the GM Heritage Center, courtesy of 'Your Name Here'"
I think it would be pretty awesome to have my truck or even one of our members trucks being cared for in the GM Heritage Center. That's like a holy grail type thing.
Make sure you get a bunch of legal documents to make sure the truck isn't damaged or messed with and will always be returned back to you. That's probably something they take care of in the loan agreement if you take that route though.
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