Hi,
As we all discover issues with our Riverstones, I felt obliged to share the attached picture.
This happened after pulling about 4000 miles. It was nailed with an air nailer I am sure and it seems odd that it bounced around enough to come apart. The piece is somewhat heavy as it has a piece of glass in it.
We went another 5000 miles and the one on the opposite side is still up there but appears to be coming loose as well.
I wont be tackling this until Spring but I will be re-attaching them with a combination of adhesive and fasteners.
My advice would be to check your rig as I doubt ours will be the only one with this problem.
Happy Camping!