Well all tractors have a pto and linkage (except the very early ones) with an engine somewhere so I can't see why there would be an issue with calling it a tractor if u had them fitted.
As moose said when ur off road watch for the hand stand they can do, it's the only thing that realy scares me in a 406 lol.
There's a pic on Google and on here somewhere of the, now mine, black mog that moose had with a camping body/pod on it