Jim welcome aboard.
I has a Sea Ray 200; 20' that weighted 2700 lbs and the trailer was about another 1000 lbs. for trailering you also need to include boat fuel and all other supplies that will be in the boat.
What 1/2 ton pick up do you have? I have not seen one that would tow less that 5000 lbs even without a tow package.
1997 2400 SCR
5.7 Vortec / Bravo 2