For sure Tom is right. The Compact Jr. we had in the '70s had an awful thin
fiberglass lay-up. The top developed a 'dish' such that water would collect in the center.
In our case we towed with a Peugeot 404 station wagon. I had a styrofoam filled ABS plastic sailboat called a Sunflower that I carried on top of the TV. The Sunflower weighed about 50 lb.
Once in Texas the mast poked out the front window on the Compact Jr on a turn into a shopping center. Otherwise the setup worked just fine.