There probably is a 12"x12" plywood backer plate located somewhere near the center of that space. That said, I've seen decals located "kind of close" and I've seen decals located more than a foot away from the actual backer plate.
And, I've seen trailers with a decal where the backer plate 'should be located" and the factory failed to install the plywood backer between the studs, so there's "nothing but a 1/8" thick sheet of luan and foam where the decal is located.
Whatever you decide to do, make sure there's a backer plate there, then check again and have a second person confirm that it's really what you think is where you think it's located.....
Remember, the outer walls are 2" thick, the outside is 1/8" luan (possibly a double ply (1/4" thick) and the outer FILON sheeting.
When you tighten the screws, you dimple (distort) the interior wall, possibly making that 2" thick wall, really 1 and 7/8" or 1 and 3/4" thick, so take all that into consideration or you might just "screw through the outer wall and have a sharp screw point on your exterior wall.....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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