What truck/ trailer set-up do you have now?
You'll get more work done with a rental 6" than that thing.
Whisper chippers, aka chuck-n-ducks, don't eat people, are cheap, and simple. NOT good for crooked brush, but that little HD thing would be eating 'salad' anyway (cut into tiny bites).
The real trick to a Chuck-n-Duck or Throw-n-Go is to not stand there handing brush to the eating machine and watching if it will eat it. Chuck and Duck. Throw and Go. Stand and Watch and get ripped up by branches.
Very fuel efficient, too, as some can be chipping at different speeds, not just full blast. Rarely does mine go over '5' for hand-feeding, but goes to '10' for machine feeding.
I always have used flatbed trailers with wood floors and walls. A lot of tight access places I can't get a truck and chipper without a lot of uphill dragging. 3k extra in dump-trailer weight wouldn't make it up the hills, either.
One is set up with 2' walls, which are held in place by stake-pockets/stakes. If I have a lot of brush, I leave out any thick pieces until the end. I cross-cut the load, never standing on the uncut material. I can flip up 4' plywood after loading as much as possible over 2' walls (wiggled down the inside of the walls). I strap over the 4' walls and around the whole frame, as at most, from a tight waterfront, steep bad driveway access removal, got 2000 pounds of doug-fir limbs into a 5x10x4 trailer, which I could park directly under the tree.
When I get to the dump spot, I take off the side panels and push off most of it. Don't need to pull it apart. A couple long, strong branches shoved under the load, used as levers by two or three people can tip off 1/2 or entire loads sometimes.
One has a small footprint, set-up up with 4' walls, making a mobile chip-box. Its been very versatile, as it carries the mini-loader, then the mini-loader moves the trailer and chipper to the brush.
Renting a mini can be money well spent on some jobs.
