You’re throwing good money after bad. For the same money or a few dollars more you can buy a brand new winch. Lots of new options up to 6000lb for under 200$
Yep. I posted a link to one above. I know a guy that put one on an old bike he made look like an early HD. Thing was pretty cool and moved right along.
Back in the day I had a job that put me on a John Deer pulling a 10 foot woods deck mowing hundreds of acres. Those killdeer with the nest right on the ground were something. They would find tiny bare patches and nest right there. When you got near them the adults would run dragging a wing...
LiFeP04 batteries are relatively safe, much safer than other lithium batteries with different chemical make ups.
As far as a bike. Lots of guys are using them for hunting, lots of reviews on hunting web sites.
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Why not be proactive and do a drill test in the transom around the suspect thru bolts and see what you find. It’s easy and harmless. Any number of people here can walk you through it.