Plenty of sage advice already posted here for picking a good ridge-top site (75% of your battle). But if one has no choice but to select a canyon or valley campsite (I canoe a lot, and that's where the water is!), I've wondered about packing a small tank of helium to inflate a meteorology-grade balloon and send up a phone to collect/send messages. I never thought about this for a "wilderness cubicle," but more for emergency purposes, e.g. post an SOS text msg and hoist the "flag." Wouldn't be feasible for something like backpacking, but that's why I like a canoe: I can pack like a car camper while avoiding the loud-talking meshbacks in campgrounds.

Conduct business via Tor and you won't need to wipe.

NOW we're talking! People simply need to listen to Reason.