As of 12/15/2015 this wireless Energy Command part is now obsolete with no replacement. Cummins is in the process of preparing the release of a smartphone app that will replace these. No more new or replacement units are available.
Some inverter/chargers have the automatic generator start feature. I have a Samlex EVO with that feature. Some Magnum inverters have it also. It would likely mean upgrading / replacing the separate inverter and converter in the PW RV.