I had always struggled fitting our boat into the single car garage door of our 3 car garage.. We'd get it done, but it took a lot of backing in, backing out, etc... Now I push the boat in the big garage door, lift the trailer and slide a couple of these dolly's under the back wheels and my wife and I can easily slide the boat (18 footer) back into the corner of the garage.. SO MUCH EASIER and faster. Once we get it in place, we lock the outboard dolley until spring where we reverse the process. Creates so much more room in the garage and simplifies putting the boat away, I'd highly reccomend.