The key to carefree boat trailering is a proper match of boat and trailer.  A proper match is one in which the trailer is designed and built to carry the full weight of your boat, engine fuel, water, and gear, and which provides proper support for the boat hull. Too high of a capacity trailer sprung for heavier loads can damage light, particularly, aluminum boat hulls.

Load-Carrying Capacity

Check the certification label attached to the trailer near where the tongue and frame meet.  It will show the maximum load-carrying capacity of the trailer.  It is required to show the Gross Vehicle Weight Rating (GVWR) which is the load-carrying capacity plus the weight of the trailer itself.  Be sure that the total weight of your boat, engine fuel, water, and gear and trailer do not exceed the GVWR.  If you don't know the correct weight of your boat and engine, don't guess; have it weighed.  This usually can be done at a local lumber yard, feed and fertilizer store, truck weigh station, etc.  Be especially careful not to overload your trailer by putting heavy baggage, camping gear, etc., in the boat. If you must carry such equipment in your boat while trailering, go to the next larger-size trailer.