My dad uses a ParkIt360 to get his boat in and out of the garage. The garage is on the side of the house, 90 degrees from the direction of the driveway, and too tight of a turn to get in and out with a truck. The two of us use to just push it in and out of the garage when I lived at home, and when my dad was younger and more able bodied. With the trailer dolly, he can do it by himself. Some things I have noticed while using it:
1) It is SUPER fawking slow. Make sure you have beers on hand before you start moving trailers around because it will take some time.
2) It's a pretty narrow unit, so when you are making tight turns with it, it wants to lean over on its side on one wheel. This makes it very unstable and hard to move. I actually fab'd a mount for the back of the dolly and added 2 heavy duty casters to help stabilize it. It's MUCH more stable and easier to use now.
This is the model he uses for his 21' bass boat: https://parkit360.ca/collections/trailer-dollies/products/electric-trailer-dolly-base-version