Like Goaty, I often think about track machines too, then I really think about it. I work on my own mainly using either a digger and post driver or tractor knocker, with either machine I can comfortably knock 300-400 meters worth of posts in a day even with all the jumping on and off. I have pallet forks on the tractor so very little handling of posts involved and there is also plenty of scope for wire rollers etc. Also with tractor I can turn up drive straight to the fence line and get on with the banging! Whilst I don't doubt that a tracked machine is more efficient once it gets down to post driving (mainly due to the ability to drive it from the back) but I question whether the logistics of getting it there would counter the productivity gain. I'd either have to use truck and trailer to transport it and thus would have to unload potentially fields away from where I'm actually fencing due to ground conditions, so time lost there. Then I'd have to either load all the stakes on to the machine by hand or have another machine to cope with handling bundles of stakes. In short the tracked knockers are just far too much of a one trick pony (and an expensive one at that) with minimal ability to clear old fence lines/handling that a tractor or digger have.
Everyone's scenarios and setups are different though and ultimately It's just a case of whatever works for you, but tracked knockers aren't for me.
