Hi mrjukebox, My 1979 Argosy 30 A does not have a guage panel either. That was an upgrade option.
The 120 volt enters the trailer thru the rear of the trailer at the circuit breaker panel. Then ac current goes to the polarity light, then the Univolt receptacle. Next, it goes to a rear bedroom receptacle, a forward bedroom receptacle, the bath receptacle, the exterior outlet, the refrigerator outlet, the galley (kitchen outlet), then to the forward outlet near the front streetside (in living area.)
Hope this helps. The other circuit is for the air conditioner.
Kevin with Baity the Lab/Pointer
//------AIR # 7303------\\
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