I bought this product due to the sloping seats in my Dodge Caravan and thought that it was going to be very useful. Boy, was I wrong. When I tried to put this under my infant carseat it brought the carseat so far away from the back of the seat that I was unable to safely buckle it. There was no way to get a tight fit for the carseat using the 1 inch rule. (the carseat should not move more than 1 inch in any direction) I again tried to use the leveler when we converted to a convertible carseat,and yet again no luck. I recommend the poll noddles, they are much easier to use and a fraction of the cost.