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Feel the tongue weight. A couple hundred pounds a pretty good starting point. Not rocket science. Use your legs and see if you can lift it. If very light the trailer tongue could pop off on bumps. If too heavy you loose "road feel" and difficult to steer. Heavy hitch weight would lift the front axle up. Stop along the way and check the rigging and walk around the trailer/boat. A binding could have loosened. All the above suggestions most excellent to follow. You do not want to lack tools or parts if something happens. I prefer a 1/2" breaker with a deep heavy duty socket for changing tires. The extra length of the socket leaves the breaker bar at a 90 degree angle for removing the nut. You can "persuade" it by jumping on it.