Nice, if you got the money.
If I had your (apparent) money, I'd burn all mine for heat! LOL!
For a KM of road that is already in pretty decent shape, I'd say that the Forestry Saws (Pro grade weedeaters) are the way to go.
If you really want to make time, find a buddy with a bulletproof truck, one that is not gonna show any new scratches, and work out of the back of it with the Forestry Saw.
I can recommend the use of a set of shoulder straps, as they keep the cutter far enough away from you to avoid leaving a shoe full of foot on the trail!
Go down the trail and get what you can with the triangular blade posted above. They work well on any tree smaller than about wrist or ankle size. Use a saw blade style to deal with anything too big to gronk through with the tri blade. Keep the saw blade units as far from rocks as you can manage!
If you are made of money, hire a guy with a brush mulcher. If you don't want a ton or three of waste wood on the road in, the Forestry Saw is a better tool, but will need a bit of cleanup after.
If you don't mind a few days of peace and quiet in the woods, I suggest a Silky style Japanese pruning saw, and a Swedish Axe, the thin bladed unit with a metal bow holding the blade. You can move a lot of material in a day, with those, and it won't leave your ears ringing!