Boat trailer

A boat trailer is a trailer designed to launch, retrieve, carry and sometimes store boats.
Commercial boat trailers.
Commercial hydraulic boat trailers are used by marinas, boat yards, boat haulers, boat dealers and boat builders. Generally this type of trailer is not used for storage of the boat.
Self-propelled.
Self-propelled boat movers are not trailers in the strictest sense of the word. They are hydraulically operated boat movers, with their own tractor unit. They share all of the features of hydraulic boat trailers.
Non-commercial boat trailers.
This type of trailer is usually used by the boat owner/operator. The trailer is also used for storage.