After many camping trips with the heater working sporadically, it's fixed!!!

The symptoms where;

Not always igniting the furnace burner when I had spark ignition (the spark clicking noise)and it was the only appliance on, burner on furnace going out when another appliance was turned on, yellow flame on stove burner.

Low Gas Pressure = Replaced Propane Gas Regulator at Propane Tanks

The regulator on my trailer was 13 years old, the pressure diaphragm wears out in 8 to 10 years.

Cost of Gas Regulator $50.00

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Les & Patricia
2006 22ft towlite (replaces 97 21TL)
2006 Toyota tacoma pre-runner 4.0 L V-6 quad cab
w/ 98 chevy Powervision towing mirrors
2017 Chevy Silverado 1500 5.3 v8 (replaces Toyota)
2 Hobie mirage pedal drive kayaks