storage box on outside rear wall

solismaris wrote:
I'm considering building a storage box on the outside rear wall of my trailer to hold lawn chairs (just 2) and protect them from road dirt. I'll make it lightweight but sturdy. The question is: how to securely attach it?

This is for a wood-framed, fiberglass-sheathed travel trailer. I'm thinking there must be wood studs behind the wall and I could securely attach the box using lag screws. If only I could find the exact location of the studs, because I don't want to drill a lot of test holes, and don't want to risk weakening the mount by screwing into the edge of the stud rather than the middle.

Sound reasonable? (After all, the ladder is mounted to the rear, and it has no problem with my weight.) Any advice on finding the studs?

I'm not considering using the bumper for support, for several reasons.

But another option may be to "hang" the box from the roof corner. That's got to be strong, right? With this option, the top corner would take all the weight, while the rear wall mounting would only be for stabilization, not support. And I know there's stuctural material there; all those screws at the roof/rearwall corner have to go into something, right?

How about this option?

Or other options I haven't considered?

All suggestions welcome. (Even "Dont' try this." But tell me why not.)

Thanks!