Since our trailer came with only one step, it was difficult for us "senior" campers to climb up into the trailer, especially when on uneven terrain. These steps come apart using simple latches in case we only need the bottom step, plus it makes them easy to store inside on the trailer floor. They're also wider than the factory step. A dowel on each end of the top step keeps it in place. The black anti-slip tape is self-adhesive and available at the hardware store. We've been using them for the last three seasons and don't even use the factory step.