Mine has a swim platform with three supports, each with four bolts going through the transom. Inside each are reinforced with a large fiberglass panel about a 1/8 inch thick. Flat washer, lock washer, and nut finish the deal. The panels are about 8 x 16 inches or so. Can't see if they are glassed to the transom or not. No sign of stress cracks from inside.
"Keep putting off till tomorrow, and you'll end up with a lot of empty yesterdays" Prof. Harold Hill