I fired off an email to Coleman explaining to them what I wanted to do. Here's their reply:
"Thank you for contacting Coleman.
Due to the volume of e-mail we have received, we have fallen behind in responding. We apologize for the delay in answering your e-mail and any inconvenience it may have caused.
Coleman appliances are not designed to be hooked to the low-pressure propane systems found on RVs. Coleman appliances require higher pressure than is put out by the RV systems.
Some RVs provide a high-pressure connection to allow the use of outside appliances. To use a Coleman appliance with a high-pressure RV connection, you will need:
First: At LEAST 15 PSI at the connection
Second: The proper hose to attach the appliance. The regulator that comes with the Coleman appliance MUST be used in line between the RV connection and the appliance
If the connection is the same as the top of a 16.4 oz cylinder, you can use the 2000005042 8’ High-pressure Extension Hose. If the connection is one like the standard POL valve on a 20# cylinder, you can use the 2000005062 5’ High-pressure Propane Hose and Adapter.
If you need further information, please visit us online at http://www.coleman.com
Coleman Consumer Service"