Not in a truck camper but in our little class C. Camped on BLM somewhere in Utah at the end of a canyon surrounded by high cliffs. Night fell so it was pitch black. The wind started blowing through the canyon and rocking us so much that we thought we were going to tip. All we could do was hang on and think about the mess from our waste water tanks if we did tip. :-D Then a gust came straight down off the top of the canyon and hit us so hard that it pushed the whole motorhome down on the springs. After we bounced back up the wind calmed down. Weather guys said 70 MPH gusts that night.