We had a three point one that my dad used for years both on a tractor and on our bale bed. He had more patience than I do. After I came home from school I decided we needed to put a gas engine on it. That sped things up considerably, but then I got to thinking. That is always a problem because it usually costs money when I try to make things work better. We were rolling up about two and a half miles at a time on a spool and then using a little trailer we had cobbled together to pull behind the ATV to unroll things. I got to thinking that I ought to see if I could figure out a way to roll and unroll wire with the same rig. Then I got to thinking it would be nice to have more than one spool, then I got to thinking that it ought to be on a trailer that we could pull with the four wheeler, then I decided to put suspension on it and fenders on it. By the time I got a prototype done I figured I had spent way too much money on it, but then I looked at the 12V winder linked on here and I realized I still don't have as much into it as one of those.
I can roll and unroll about eight miles of 14ga wire without having to change spools. The other bonus is that I am really crappy at math, and I messed up my sprocket reduction calculations. It winds wire so fast the first time I used it I about had to go back and change my drawers when I saw how fast the end was coming at me. Now I need to perfect the prototype next winter and redo my calculations.