Get a pop up....we never had any leak issues when we had ours. Things touched the side and there has never been any wicking done. For what you described, this is what you want...
Visit
Pop Up Explorer. It's a great site and tool. There is a forum on there with thousands of pop up owners. Ask questions there. Yuo will get a better view from thousands of pop up owners. The guy that runs the site, Dean, is a great guy. I've known him for about 12 or 13 years.
We have a Class C and have had a TT with a bunkhouse before (besides the pop up) and if we had to give up the motorhome, we wouldn't go back to a TT (nothing against them, we like them), but we would at least have a pop up. Hae been from the mountains to the beach and everywhere in between with the one we had and loved every minute of it.