The ceiling is stable per se law. The good thing is that they do not slip around in the car, because of the lower Velcro straps on the ceiling are. From above it is slightly dimpled, so de dog also has a good grip. The Velcro strips on the sides are rather pointless in my car, because el left NPD is dressed right only with plastic and fold down the edges so repeatedly. Mn must therefore make sure that the car is around dressed in the trunk with fabric. Also in bumper protection was a crack very quickly.
