Screwing into Exterior Shells

[BaconLover]

OK, need some advice here - I posted this on the FB site too but thought that some people who know might not be on that site.

We bought a camera from Ford so we could use the aux camera input on our F-150 on the back of our TM. We tried different locations on the top and back of the TM and have found the spot (see pictures).

Question: for those of you who have actually screwed things into the exterior shells (like solar panels, cameras, etc.), what is the best way to do that and seal it? I'm really nervous about screwing things to the exterior of the TM.

We're going to mount the bracket as low as possible where the bracket sits flush with the TM vertical exterior, and we're going to try to avoid the curved part of the shell, since I'm assuming it's a bad idea to screw things in there. Thanks in advance!