I work and have worked on Class A motorhomes for 37 years. I have NEVER seen a Class A motorhome have a System that kills the ignition thru a Keyless entry or Alarm system FROM THE FACTORY. I fail to see how Alarm installers would know or determine it was Factory installed. Some Keyless entry systems HAVE the capability of using the Igntion lock out that is designed into the Keyless or Alarm system. All you have to do is use the relay and cut the ignition wires at the Dash Key Ignition switch. The plain fact is, below 500,000 dollars you will not see a Ignition kill system from the factory. Motorhomes, especially Diesels can have enough problems without adding a KILL system thru the Keyless/Alarm system. It would be a big headache for OEM's to incorporate a Ignition kill system. Doug