I used to keep my first Hobie, a Hobie 17, suspended from my garage ceiling. I couldn't fit the boat on the trailer inside the garage, so I kept the mast on a rack on the side of my house, hoisted the boat off the trailer, and rolled the trailer all the way back. It just fit, allowing me to close the garage door. Amazingly, I could get everything on the trailer and tied down to drive to the lake, in about 10 minutes!
I had to have the blocks for the bow set back 8 feet, so the garage door had room to open. This made hoisting the front of the boat much more difficult than the stern. If you have the weight distributed evenly, and use good quality blocks with an appropriate mechanical advantage, it won't be difficult to hoist. Good blocks are pricey, though.
(I just looked at the photos of the system for the Wave. Cool. Way over-engineered, but cool.) I had 4 webbing straps sewn to D rings by my local shoe repair place, sized to fit around the hulls comfortably. I hung 4 to 1 blocks at each corner of the boat, from the 2 x 6 ceiling joists in the garage. I had 2 cleats on the wall, so I would hoist the front of the boat a couple of feet, cleat it off, then hoist the back and cleat it, alternating until it was fully raised. For a 21, I expect you'll want 6:1 blocks at least.
I now rent a storage garage for my sailboats, and keep them on their trailers ready to go. I use the pulley systems now for kayaks. I seem to have a boating problem...
_________________ Yet another Bob! "Firefly" - 2012 Hobie Getaway with wings and spinnaker "Sparky" - 1978 Sunfish (OK, it's not a Hobie, but it's a fun little craft) Too many canoes and kayaks
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