As said: A so called small traction engine. From its era it was originally equipped w/steel wheels, (IOW pre-pneumatic tires), upgraded to what may be early 30's Ford wire wheels. Likely had a single cylinder, water cooled*, 4 stroke 'make & break' engine. The flat rim wheels, at the tow bar end, were the drivers for one or 2 belts, ~ 4" wide. Working engine speed around 40 - 70 rpm. *No pump or radiator; just a cast iron tray of water. Some fair grounds will have a few on display. There are often gatherings, especially after harvests in the fall, where they saw, chop corn, thrash, split or just make nice sounds, chuffing.
BTW: The earliest traction engines were steam driven; Some as big as a locomotive.
At a gathering you'll see small ones, restored; including polished brass, grand paint jobs w/striping, even gold/silver leaf. R3~
Any early Guzzi twin w/exposed valve gear and ankle polisher would fit right in. R3~