These brilliant accessories for inflatable boats and dinghies with a transom are simple to use and can save a lot of struggling when launching. The wheels easily lift up out of the water to self lock when upright and drop down to click into the auto locking position for recovery from the water and launching off the beach or slipway. Self contained with no fiddly bits to misplace. Bill, one of our UK customers kindly made a demo video which includes installation and launching from a slipway. Thank you Bill.