I have one of the TSC 1000# carryalls that I have built into a multipurpose carry platform similar to the Wilson's one. Mine has hinged sides that can be folded in to make a simple L-shaped platform, or folded out to make U-shaped box, or I can slide tailgate boards into channel iron in the sides to close up the back. Finally, one of the tailgate boards can be placed (in brackets) across the sides to make a (fairly uncomfortable!) seat. It is set up with plastic tubes for tool handles (rake, shovel, broom or whatever) and a chainsaw scabbard.
I like the setup I've made, but I would wish for a sturdier frame. Mine bent at the welds from (wet) firewood weight, and I had to have some extra welding done to beef up the weld points. For my DK45, I'd like at least 1500#, if not 2000# capacity.
Bob