Anderson Levelers

salem wrote:
... If you are parked on a slight slope is there any chance that the wheels can roll off the levelers? Or, does the shape of the levelers prevent that? ....

After you roll it up to the desired height you place the wedge under the now raised part so the tire is sitting in the "valley" of the curved leveler so it should not roll. I still use my between the tires BAL chock.