If it has an Engine
Thats it really, love looking at any old vehicle, everything has been designed by somebody and thus its quite fun trying to work out their inspiration.
Robby the Robot
If robby drove or built a tractor (and as we all know Robby could build any thing, especially good at Whisky as the story goes, ‘Forbidden Planet’) i suspect it would look like this.
It's about people, stupid... 