Good points raised here. The majority of our workload is too far from home to consider driving a tractor, and most of the jobs we take are big enough to justify moving equipment. We take the tracked knocker and a tracked skid steer to most every job. It takes two trips now, but I'm hoping to get a smaller driver set up to eliminate one trip. We usually are able to schedule our fence jobs on a route so as not to waste miles. Also, I usually have a crew, so they can be clearing, scattering stakes, or stringing net while I'm driving posts, where a tractor mounted knocker would take away that capability. What works for us, wouldn't always be the best fit for someone else. We also can't legally exceed 25MPH in a tractor.....