And the top of the carry all attaches to the trailer hitch socket I attached to the back of the FEL
I discribed the trailer hitch in a previous port under atachments a few months ago.
see photo
I have the TSC carry-all on my BX2200. I've just been using a pallet on mine as a platform (the one my tiller came on). Works for what I use it for, mostly hauling bags of "stuff" around, like compost, etc. I've had as many as 16 bags on it at once, with nominal weight 40lbs/bag, 640 lbs. Also had 9 bags in the FEL for counterweight. I've been thinking about putting a back on it to make it easier to stack the bags to the front.
I will put 4 sides on mine. I better be careful with the type and thickness of material I choose. If I'm not careful the weight of the carry all will exceed the lift capacity of my BX2200! I may use treated 2X8s for the floor and treated 4 quarter for the sides (1 inch). Not sure how I will attach the stake pockets. I also want to make a dolly that I can set it on when I am not using it (2X4s and 4 casters).