A relatively easy setup for towing your small boat (mine is a 12' Portabote that I'm too lazy to set up and take down, weighs about 100 lbs), follows:
U-Haul hitch # 29132, $250 installed. Clears DTH dual center tip exhaust if the LONG ball mount (from U-Haul) is used. U-Haul wired my smart for trailer hookup for $40. If they install their state of the art female wiring terminal (with led lights for insuring your circuits are functioning), you'll need their 3' wiring adapter to match your trailer's FLAT male terminal.
This is an 1 1/4" hitch.
HAUL-MASTER Boat Trailer with 8" Wheels and Tires (retailed by Harbor Freight, Item 5002-6VGA, $329). If bought from Harbor Freight, it may have to be "special ordered." Have the Harbor Freight store do the ordering and you'll pay no shipping charge. You get to assemble it.
1 7/8" ball.
The LONG ball mount has a 3 3/4" rise, which will be about right for the height of your boat trailer tongue.
I wish you fair winds and following seas.
Louis