It is at a museum in Yreka California. It's in pretty bad shape, with many missing parts, it appears. Has an opposing piston twin cylinder engine of some sort. Looks like it was probably factory built, rather than cobbled together, but I could certainly be wrong about that.
It was one of the very first ATCs introduced. Honda later refined them a fair bit, and added pneumatic tires, which caused a bunch of accident law suits, and then they added a second tire in front.
No idea...but, there was probably a good reason a one wheel drive tricycle never caught on. Ed
La Crosse Happy Farmer of some sort, or a custom built one from the same company, or it's missing one drive wheel. From here it looks like it was built as a one wheel drive plow tractor, not a two wheel drive symmetrical tractor. The one offset wheel rides in the furrow to auto steer.
Delmer ... I am awed by your knowledge ... Here's some more info on the mechanicals. https://www.gasenginemagazine.com/tractors/happy-farmer-tractor/
Yeah, the first one in that article looks very similar.
about :38 Happy Tractor started in Minneapolis, was bought by the La Crosse equipment company and moved to La Crosse, then sold to Allis Chalmers at some point. I believe the plant made other farm equipment before and after WWII.