The walls get wet, and we wipe them down with the towel when we get out of the shower. We never had an issue. The water just runs down the walls into the tub.
Model X19H Expandable
GMC Sierra Pick up
Been a camper since I was a kid, and that was a long time ago :)
From pup tents with no floors, to tents with floors and flies, to a pop up, to the expandable.