First time I saw something like this was over 20 years ago. We were waiting our turn to retrieve a small boat at a launch ramp on a lake. This thing that looked like a houseboat came through the crowd of waiting boats honking his horn and waving to everyone to get out of the way. When it reached the launch ramp it just kept on driving and, when folks realized what it was, everyone was clapping and cheering.
Back in the 60's my wife (at that time) and I bought a trailer that converted to a houseboat. It had the normal trailer hitch in front with wheels that cranked up and down by hand. There were heavy duty brackets on both sides that folded out so that 2x12" planks could be layed on them. Regular outboard motor on the rear.
To say the least, it was "rustic" but we had a lot of fun with it for the 3 years we owned it. I used to love watching peoples faces at the launching ramp when we backed it into the water.