I may be wrong, but it would seem that grapple skidders would be faster and more economical in that terrain. Was hoe chucking specified for less ground destruction, or am I missing something here?
As a young lad, I sat on the bank of Higgins Slough in Central Park, WA back in the mid Sixties, and watched Roberts Brothers Logging "hoe chuck" a swamp with small Unit brand shovels and 'scissors booms' that they designed. There are a couple of photos here, in the "Cable Shovels" thread, I believe. They could actually walk the shovel out of a wet spot by dropping the tongs on the boom tip hard into the ground for traction, and letting the shovel pull itself out. How I wish I had some video of that little operation!