Wanted to give everyone an update. The ideas were all very much appreciated. I did consider a dump box but it was just too far out of my price range and extra to worry about and maintain that I just would not use enough to justify the price.
Ended up getting the 7K that I linked originally. Picked it up a few weeks ago, and very glad I did. I looked at a few other trailers while I was onsite and this one is just a monster for the $. Full 2x4" tube construction for the box, fully welded not spot welded, heavy diamond plate walls and fenders, full LED lighting, breakaway controller and dual axle brakes, drop tail with half sheetmetal covered and full ramp expanded metal, big rubber feet for the ramp, and ramp is 100% removable without use of any tools, heavy duty tarp/tiedown hooks. Fenders even have a support brace so they can take standing on them, and have no skid pads installed.
I have not done my 1st loaded run with it, I went out and bought a brake controller for it, super easy install. Got it all done just in time too I have a full 2 pallet shipment landing tomorrow (5400#) for it's maiden voyage and will give an update after that.