This has nothing to do with ebay, but many years ago I had a Korean War vintage 4X4 Army Truck. When I was shopping for parts I dug up some outlets for Army surplus equipment that blew my mind. You could buy Ducks, armored cars , half tracks, tank retrievers which are basicly a tank tow truck with multiple winches and able to pull ungodly weights from ungodly distances. They had all kinds of things that I had no idea were available to the general public , and prices were pretty reasonable too.
Rick