I used some metal drilling screws with rubber washer on mine and and no issue drilling into the fiberglass exterier. I don't remmber the brand of camera, but is on link as posted fom Amazon. Wasn't to sure about quality but it works great and cameras are not lightweight hardware. I and my wife can swear by this system and works great as a backup and rear view camera. Can add a bit of gorilla glue if not sure about screws holding as an extra safeguard, but mine seems to be doing very well. Can aim up or down more after install as needed for use. The wiring going through fiberglass comes with rubber gromnets for a tight fit and for safety sake, I dabbed a bit of Dicor caulk just as an extra touch, but it is on a vertical plane, so not likely to leak without.
Hardest part is fishing wire behind panel, but a wire fish tape did the trick, even through some styrofoam. Top camera was in the curved top section where no foam was tight and went through inner wall also and ran through top molding on the inside and out sidewall, to the floor and under carriage on both cameras. Did entire system in several hours, and was unsure about it all myself till got into doing it. Thought firstabout paying someone, but decided to just go for it and looksas good asa paid job.