I got one of these a few months back at a vintage store for $15. The owner couldn't pay me to take it off his hands — he reduced the price from $20 as soon as I

I got one of these a few months back at a vintage store for $15. The owner couldn't pay me to take it off his hands — he reduced the price from $20 as soon as I expressed interest. It works wonderfully! Once I rounded up a ton of D-cell batteries... It has the pull-behind trailer, which is a genius design. The hitch pin is also a TRS plug which transfers the signal from the tank to dump the trailer. It also allows the tank to do a complete 360 while towing, since the hitch reaches out and over, then down, to the center of the tank. The whole thing is just a brilliant piece of engineering and represents, as far as I can tell, the first fairly affordable "AI" home toy. Pic of it on my shelf: https://imgur.com/a/5JLoXoJ https://imgur.com/a/5JLoXoJ