[tentcamper]

There are seals along the bottom inside edges of the upper shell to seal it when closed. You should not be able to lay on your back and see up into to the closed camper. Each of my campers there were a few small areas that did not seal real well, but no issues. Never had a wet wall after traveling through a rainstorm. The fender cover can bow in and be a small issue, we installed an aluminum rod across the inside edge to keep it flat, issue gone.

If traveling on dusty roads, we found to close off the bathroom vent from outside and dust was greatly reduced. I tape it over with duct tape