My old FGF was a coupe. I towed a 1964 15 1/2' boat with it to Lake Shasta with no trouble for several years.
The hitch is a bolt on style that has a metal support plate behind the licence plate and two bars that reach back and bolt to the front side of the trunk.
The only thing you see once it's installed is the flat ball mount sticking out below the licence plate.
I'm thinking of a 3' x 6' lightweight utility trailer for suitcases and such...