A boat dolly or boat trolley, also called a launching dolly or launching trolley or simply a dolly or trolley, is a device for launching small boats into the water. It is generally smaller than a boat trailer with smaller wheels and is not suitable for towing a boat on the road. Boat dollies can be useful for launching boats where there may not be a traditional launch ramp, and may reduce the amount of damage that a boat may take when being launched.