Our Rottie (100 lbs.) had two TPLO "knee" surgeries six months ago. The back seat of the Chevy Silverado truck is just too high for her to enter, even when putting her paws up and we boost her rear. Plus she is too heavy to comfortably boost at that height.We recently took a seven day road trip where she used the steps up and down at least four times each day. This collapsible stair was perfect for her to enter and exit the back seat of the truck. The steps are sturdy. They open and collapse easily and store behind the front passenger seat. The two support braces at the top of the steps set into the back seat rear crevice and right at the front edge of the back seat. We had a dog cover on the seat which helped to keep them from slipping off the seat, plus at each use I braced the steps with my foot to keep them from slipping on the ground/parking lot/gravel - wherever we parked. We insisted she step - step - step down instead of jumping but that was the only training necessary. (We have steps in our house.) She went up them easily from the start. They are wide and not slippery. A decent product, ready for her use, we hope, for many more years.