Given the dual pistons, this might be a Garwood model, but I couldn’t say for sure. Unclear what the value is or what it would take to restore it.
https://atlanta.craigslist.org/eat/pts/d/mansfield-willys-dump-bed-unit/7165964402.html
Original dump unit from a 1960 Willys Jeep. Complete unit with tank and pump. Could be used to turn virtually anything into a dump bed.