Making a cargo deuce dump has its challenges. Personally, i would prefer to keep the bumperettes, but I have only seen one conversion yet that has kept them. I am pretty sure it was Gerhard's truck.
I have lost my bumperettes, but I have retained everything else. (well aside from the pioneer rack... which is impossible to keep in the stock location)
The electric power packs are great for simplicity, but they are quite slow. I am happy with my PTO driven setup, although it needs some work (primarily in the seals department... it is an old setup.)
The nice thing about how mine is done, is its a bolt on setup to the truck. Only modifcation to the truck frame, was I had to remove a cross member for the cylinder to clear. The bed is welded to the dump frame in patches every 18" with about 1" of weld.
I have had some really heavy loads in mine, but nothing I would consider is 'too' much. It was built primarily for firewood, and works quite well, especially when loaded by the elevator