ramblings,
The 4 wheeled wagon put together by Cowboy Billy sure seems like a good rig.
chilly807 nailed it when he wrote "It sounds like you're in the same boat a lot of us are, you have a small scale wood harvesting job to do, and the easy way to do it (tractor and winch) is fairly expensive. The flip side is that the cheaper way to do it is harder on you labour wise, and may tear up the woods more."
I talked to the sawyer in Maine, and he says frozen ground is very good, but frozen with some snow is even better, as far a dealing with mud on the logs. A woodcutter friend who uses horses is suggesting I find a way to use a Farmi winch, maybe rent one, as they sure make twitching out the logs a lot easier.
Recalling how old timers moved houses with rollers or how boatbuilders launch huge vessels on a greased track, this log moving work I have to do also comes down to friction. If there is limited friction as with the roller or the grease, the object moves easily like Cowboy's wagon. There is an Ag fair in Maine called Common Ground, and their woodlot is managed with a wagon, pulled by a tractor, and the wagon has a loader. Another good rig.