ronfisherman wrote:
No screws into outer walls.
I don't think you will find ANY of the factory "stuff" on the inside walls have screws going through to the outside. Just using a bigger bracket with multiple screws in each one should work fine. Or the similar solution of wood mounts glued/screwed to the inside wall as was mentioned by a couple of posts already.
If you do insist on going through to the outside, please use stainless steel. If you don't, the screw heads will rust causing streaks down the siding.....maybe in less than a year.