I have 3 Dodge 3/4 ton trucks and have broken 2 hitches! First was my 2000, my employees use to haul a 20ft. Haulmark enclosed trailer with 2 lawn mowers inside, (Pics in rigs gallery). It has a tongue weight of about 500-600 lbs. and a gross of maybe 6000lbs. They must have hit some railroad tracks hard or something cause the hitch peeled away from the frame, breaking off near 4 bolts in rear, only 2 were left holding the whole thing together. Got a new class 4 hitch from the local hitch center, they said that Dodge buys the cheapest they can get. My next broken hitch was on my 2001. (Pics in Rigs Gallery) Been hauling a 24 ft. Haulmark for 3 years, same deal, full of mowers, weighs in at 7-8k w/ tongue weight of maybe 7-800 lbs. , funny thing about this hitch was that it broke with a 350lb. back blade snow plow on it, guess that plow put too much strain on that stock cheap hitch. Same hitch center says the new one is probably stonger than the frame rails on the truck, so no more worries.
Just be careful what you haul and how heavy it is, and inspect the hitch from time to time. Your boat should be fine for quite a while. If in doubt, pay the $250 or so for peace of mind.
Kevin