Like a train, it pulls things along, mainly trailers.
Not quite. That would be a locomotive, and those pull cars. Except, maybe, in your two track mind.
Tractors are specifically designed to pull things with, whether it's a farm tractor or the OTR version.
And it's a tractor by default since there's no cargo area, which would make it a truck.
Anyway, that Pete was originally registered as commercial, until I figured out a way to register it as an automobile. That was $40/year instead of the $1,600 I had been paying. Plus no log book and all that nonsense.
Once here it was registered more correctly, as a motorhome. It was always used an RV.