We had a boat like that in Jr. High. Bought it at K-Mart for $100. We tied it to a Radio Flyer wagon and towed it to the river behind our bikes.
I can't recall ever seeing one before. The moment I saw it, the tires reminded me of what is on the center pivot irrigation setups. When I was a kid, especially when we were on road trips and I was looking out the window daydreaming, I would see the tires on the pivots and imagine them on a bike or motorcycle.