A Roadmaster Direct-Connect style baseplate allows you to connect your Roadmaster tow bar directly to the baseplate, eliminating the need for a crossbar. This is Roadmasters easiest system to connect and disconnect. If you are using a Roadmaster motorhome-mounted tow bar (except Sterling), this is the baseplate you should choose. For a Sterling, Stowmaster, Tracker, Guardian Rock Shield, or Tow Defender part number 4700, use a Roadmaster Crossbar-Style Baseplate instead (sold separately).