Twistep is an instant, multi-use step that helps your dog get in and out of your SUV easily. It attaches to the hitch receiver of your vehicle and stores under the bumper when not in use. Twistep provides your pet with lower-impact, lower-stress access into and out of a vehicle. Repeated jumping into and out of a vehicle can aggravate or even cause serious conditions like arthritis, leg injuries, back sprains and other spinal damage. And lifting a large dog into a vehicle isnt easy! Twistep was designed for single hand use, so you can have a leash in your hand, while you easily position the step into place. Twistep easily swivels out from under the vehicle in a few seconds just when you need it. And it tucks out of the way under the bumper when you dont. Unlike ramp alternatives, with Twistep theres no time consuming set up required. Theres no heavy, awkward or muddy items that you have to stow in the back cargo area of your vehicle. And importantly, theres no more lifting! Included with this Twistep is the Threaded Hitch Lock to secure your Twistep to the receiver hitch and prevent theft. 2 Keys are included with the Lock. Note: The following vehicles require the TWISTEP Extension Bracket (item #3053) to provide additional clearance for the spare tire: 2006 - Current Chevrolet Tahoe, 2006 - Current GMC Yukon, 2006 - Current Nissan Pathfinder, 2014 - Current Jeep Grand Cherokee, 2018 - Current Ford Expedition. A minimum of 16” ground clearance is required from the lower-edge of the receiver. Twistep does not fit a 2019 Subaru Ascent and most mini-vans due to either the bumper configuration and/or ground clearance.