Brad: My daughters Jayco popup has connections to use the stove either inside or on the outside of the trailer. They are quick connect couplers with a lever on/off valve attached to a flexible gas line. You should be able to get a line custom made by a
propane dealer in the length you need and attach it to the "T" connector you have. When I worked for a heating company we frequently used copper line for propane gas installations and would install a flared "T" connector if we were feeding more than one appliance. Depends on what your trailer is piped with as to how you could tap into the line. Carefully checking for
leaks is very important with propane, soapy water works good, a manometer tube is better as it will show a leak that may not be visible. Bob