Nope...hydraulics are way too complicated. I want 30" of travel at a minimum, meaning either a really big cylinder, or a really big lever. The winch and a single pulley should work just fine. I can easily do pullups on any single rafter (tested), and my weight is roughly equivalent to a full fermenter. So far, this project screams $15 hand winch...
EDIT:
Fingers...ever use a "come along?" You can move a surprising amount of weight using only the mechanical advantage supplied by the gears in a hand winch. I've moved thousands of pounds of car/boat/tractor/etc onto trailers that way. A single fermenter will be child's play in comparison.