I had thought of building a tilt flat bed on my dump as well. the bennefit to the short frame is you can put a longer bed on it and get it close enough to the ground to load vehicles with a set of ramps. I was just going to tear down the dump bed and fab up a deck on the frame & lift, cover it with diamond plate and mount a winch up front. So long as the load is centered fwd of the pivot it will lower on it's own. But for safety I was going rig a locking mechanism up front to prevent popping the deck while loading/unloading flat loads.

1956 GMC 370 dump " 'Tater "
1970 VW Volksrod "the Black Bomber"
2007 Chevy Avalanche
2020 Jeep Cherokee Trailhawk,
2005 Harley Davidson FLHTCUI

I dig all cars, old and new, whether they were hammered out of American iron, German steel, or Japanese tin cans. Being unable to appreciate them all is missing out on a world of great things.
But thats just MY opinion! :P