See if he wants help moving stuff to a nearby scrap yard. I would be willing to move a few cars for him(for free) if it made sense. Of course he might need titles, etc.... donating a few hours of service would be a decent way to see his collection.
I've had a few friends reach out trying to get stuff and most can't even get a hold of him. I don't see him ever selling them all without someone stepping in and doing it for him. One friend was able to get a old Datsun off him though.