I've only got the one slide, but have found that if I try to deploy it with the unit not level/stabilized it seems to bind slightly on the way out. Seems to me that it would be pretty easy for the independent suspension chassis to be slightly skewed due to the ground and cause such a big opening to be out of square/plumb, putting the slide mechanism in a bind. I would think leveling the coach first would take out most if not all skew and instability before trying to deploy the big, heavy slide(s).