Attaching to walls

We have a 2012 R-177.
I am working on a minor mod that involves attaching 3/4 x 2" wood to the outside wall to create a wood slat partial cover for the window and blinds so that we can lean against the window/prop up in the bed and read or watch TV.
My question: what is the best way to attach wooden strips to the outside wall?
I gather the outside walls are about 1 1/4" thick.
Stud finder does not seem to find "studs" in the wall.
I've read through many postings and not found much on this topic.
Thanks,
Tom Wagner

    I used very small molly bolts they were about 1/8" bolts and drilled a small 1/4" hole for the part that inserts into the wall for the bolt to screw into. But if you could locate the aluminum studs in the walls on each side of the window that would proably be better. There is a video of the forest river factory, showing the rpods being built. That is on the rpod nation forum, not sure where to look for it. But in that video it shows you the framing of the side walls before the fiberglass panels are attached. Hope this helps.       David     

From my experience, everything in the pod is screwed to the interior plywood walls using fairly short self tapping screws. That includes the framing for the dinette seats, the valences, the supports for the bed in our 171. Granted, not all the screwed in boards are weight supporting, but neither is the brace that you are creating. I would use sheet metal screws 1/2" longer that needed to penetrate the brace. Using the dew method or luck or the photos above, you might well hit a framing member. But again, if you are only leaning a board against the one-by, then several screws will be sufficient to hold it in place.   Walt

Outbound and I added shelves to our pods using molly bolts.  More info at the links below including the sizes we both used.  The first link is pics of my installation, the second link is his installation, read both pages of his.

Tom, as far as finding studs, just inspect the wall carefully.  You'll find the spots where the factory stapled the wall board to the studs (they're filled with a color-match putty).