I don't an on pulling any 5k logs, I was more worried about the times when they dig into the dirt while being pulled or snag on other logs or limbs on their way out adding to the weight. We also figured the winch would be able to pull double the weight of the Jeep it was mounted on, so I figured about the same for logs, but since they aren't on wheels I wasn't sure.
The 9k winch uses less amps when pulled at say 3k then a 5k winch would, I would have to check the line speed, I'm sure it's gig her too.
I know the ins and outs of winchs on Jeepsr, just not sure how to size them for logs.