I finally discovered the source of my propane leak! Between the threaded piping under the coach to the furnace there is a short piece of copper tubing with flared fittings. Apparently the original installed piece was a mite short and after many(60,000)mi the strain on the flare took it's toll and the flare on the tubing split. Leaked enough to blow away soapy water without bubbling.

Tell me you slept better after finding that..