Really great product on a level concrete pad or ground. The design does allow for flexing over an uneven surface, but the slope is just relayed to the pipe. One would still have to prop the Sidewinder up to keep the downward slope and things rolling downhill. I do like the fact that the sewer line is off the ground and for that alone I would surely invest my money again. I was concerned that the Rhino pipe would have difficulty setting into the sidewinder, but it works great. Easy, compact storage is a huge benefit. I would recommend getting 6 inch mini bungee cords to hold the sewer line onto the Sidewinder. Lastly, the plastic is a softer plastic. I would have thought it would have been out of a harder plastic. We'll see how it holds up over time. Very pleased with product and will buy another one when this one wears out.