We bought a , 1996 Niagara with the ABS roof last year. The roof is in quite good shape, no leaks, there are small cracks just above where the plastic awning rail was (there is only about 6 inches of the old rail left), but no de-lamination. I guess it helps that the climate here, Vancouver Island, is very mild. Seldom gets below freezing in the winter, and seldom gets above 80 in the summer. We have purchased a new awning and an aluminum awning rail, I am wondering what would be the best way to attach the rail. Glue, screws, pop rivets, threaded inserts and bolts, a combination of these?