SpaceBus
Minister of Fire
I don't have a tractor (yet), but on my wood trailer (just a cheepo Harbor Freight with wooden sides) I put a cheap (HF again) worm drive hand winch, which I removed the handle from and use a power drill to turn.
That, plus a set of homemade log tongs does fairly well at dragging them up to the trailer's tailgate, although it needs help on larger logs.
For really big/stubborn logs, I hook a proper log chain to the hitch on my truck and pull them with that.
Can you post some photos of this setup? Sounds nice and doesn't need electricity for the hand crank winch. A member in this forum is getting/got a capstan winch for skidding logs. A skidding winch for my tractor should be here today.