For some reason I never thought of loading a trailer like that while unhooked. With your procedure of chocking the tires and with a good tongue jack I see it can work.I know. It does have a substantial tongue stand, so you can unhook it and set it on the tongue stand, load it and then back under the hitch with a three point receiver ball. I actually did this already, worked pretty good, although you wouldn't want to load it when it isn't level or you would have to block the wheels pretty well.
That said, I plan to use it this way so we'll see.
I like this better than the wagon type mainly for negotiating tight spots backing up to dump. Also the way the tailgate can operate like one on a dump truck or easily removed.
Might have to take a trip to Clearfield soon.....