The SEARS "Dune and Trail Cycle" was as far as we know, Sears' unique design attempt to enter the market. However, it is speculated that HPE Muskin fabricated this unit as a Sears exclusive.

Though SEARS did not publish a proper name, the "Wild 3-Wheel Roadster" is the exact same model as the 1972 HPE Muskin Scat Cat,  the 1973 JCPenney Mini Scat Tracker.