Over the last 13 years of full timing, I've seen several people on the road with slides open. One guy and his wife looked to be 80 and they passed me (two lane road) going the opposite direction so quickly I didn't have time to wave or point. Oh, well. Once saw a 5th that had 4 slides and two of them were sliding out than back in at corners.
So I've seen it happen, never done it myself. But have left the antenna up a couple times, and the door awning extended when I moved the RV inside a park once. Once left the 18' patio awning out and tried to drive away (doh!), only drove a few feet though. Once drove a few feet in gravel with the toad's tranni in Park and another time drove a couple miles with the tow bar installed wrong...car was weaving back and forth.
Twice over the years have driven away forgetting to unplug or disconnect the hose. Embarrassing.
My brother drove away once with his towed car in Park and ruined the engine. $5000.
