Not with a truck - but about 8 years back I bought some surplus electronic equipment from GL. I believe it was a pallet load of AN/GRA-39 radio control set residue. They were pretty shot, I think out of the lot of 15 of them, I managed to build 2 working one out of the lot, which I promptly sold at a show. The rest I tossed in the landfill, just a mess of jumbled wires and cracked casings.
A couple months later, got a letter from some branch of the DoD (I can't remember which) telling me they had changed the demil code on those items, and they wanted them all back. I found it kinda weird, to recall some items AFTER the fact due to a demil code change (were they doing the same to those who purchased radios in the 1960s and Kevlar helmets in the early 1990s?). Anyways, wrote them a letter back saying I had since disposed of them and they were no longer in my possession.
However, that was with small items. Hard to say that if GL or DoD comes calling, and your truck is registered in your name and is sitting in the driveway.