OK guys, the man said he had a FEL, and a brush cutter. So, though a used box blade isn't costly, and is the implement many of us would use - that's not germane.
It seems the tires on 1 side of your tractor (after a particularly rainy day so such will sink maximally into the muck along your road - if you don't get stuck) would be the easiest. Then, with the rut in place, you could slip those tires into the same rut, tilting your tractor and letting the FEL (now in the full down position) carve out a progressively deeper rut as you traverse that path, with a progressively tilting tractor, on however many occasions required.
Back up plan is REALLY time intensive, if you've a long path, and that's to use the FEL to dig out a trench along your path/road. Such assumes you can fit your tractor sideways across the path/road, with some room to manuver.
Whatever, "seat time" on a tractor and along a pretty country path/road is, to me, prime time.