The UBars bars provide tether points for the dogs to attach to as they work with Roading harness they are wearing which makes this a push not a pull type dog sport. This gives us a smaller footprint than a traditional dog sled as it keeps the dogs more in line to prevent them from deviating all over the trail. Because of this design I created it makes it possible for us to be welcomed on almost any trail as we will not encumber any other trail users as we travel all over the east-coast of the USA to adventure on this rig I have created. CLICK DOGMOTOSPORTS LOGO TO LEARN MORE