Update:
Original Poster here.
I've been deliberating how I wanted to implement a small crane or hoist to mount and demount my 10in rotary table and Kurt D688 vise on my Bridgeport, and to change out chucks on my lathe.
I've scoured the web for ideas, and looked at both Harbor Freight pickup truck cranes, and the Unistrut trolley systems, as well as others. I actually have other lifting devices for heavy lifting, but they don't fit well into the corner where my tools are.
The Skyhook has it's fans, but they're spendy, and I've never seen one in person, so I checked Craigslist for a used one. One popped up in Muskegon, Michigan, and included the cart and counter weight accessory pack. The unit is basically new and unused. Some of the packing material is still attached!
I briefly debated whether to make the 2 1/2 hour drive, each way, but the asking price was $400 which is approx $2000 less than the published asking price at places like MSC. The seller says they bought a couple of them but then consolidated some shops and didn't need two. He agreed that he would hold it long enough for me to drive there.
I met the seller in Muskegon, we loaded it into the back of my SUV, and I am now the proud owner. This may even qualify as a tool gloat! See attached pic.
The only downside is the floor space the cart takes up, in my already crowded 28 x 30ft shop. If I decide I don't like the cart I could probably sell it for most of what I paid for the shooting match, and keep the crane. The crane is easily movable to any place where I have fabricated posts to accommodate it. It also has a bunch of mounting accessories available.
Owning a crane takes all of the fun out of looking for a crane!