Re: longer hitch for launching boat
To answer the question of "why such heavy tongue weights?"
Easy... tongue weight should be 10% or MORE of the weight of the all-up package of boat and trailer.
I'm at #2950 for the boat, probably #1000 for the trailer (minimum), without any extra gear. So Figure #3950... 10% is 395lbs, and the tongue is every bit of that, if not slightly more. THAT'S why such heavy tongue weight! if you are less than 10% tongue weight, you have a serious unbalanced rig and should consider moving the boat forward on the trailer.
The Capri 25, cheap, fast, trailerable, and paid for...
"We're going the wrong way!"
"Yeah but look how fast we're going!"