I would go with the 3M Fast Cure 5200 adhesive. It's flexible and strong... Maybe put some duct tape under the tramp to serve as a form until it dries.

Here is a different tramp issue... I have an old H16 beach beater that the sun and salt had worn the black rubber coating off the surface of the tramp. The threads of the cloth was exposed and I was worried that it would not hold up very long. I used Plasti-Dip (paint on and spray) to coat the fabric. It was worked out great. If you get the quart size you will need to thin it to paint on. The spray went on smoother but not as thick.