I can't help much. On modern trailers the furnace runs off 12v DC and propane. If you have a stove, make sure you have propane by burning a burner on the stove for a minute or so. The furnace will have a DC fuse in the power center - usually a 15 amp automobile type fuse. If you have a good fuse in there, the furnace will be controlled by a wall thermostat. There may be a heat on/off switch on the thermostat. When the thermostat is turned up, and the heat on/off switch is on, the furnace fan should come on. Again that runs off 12v DC. Then the gas should light with a spark also powered by 12v DC. If the gas doesn't light after 3 attempts with sparks then the furnace will shut off. To reset it, pull the 12v DC fuse for the furnace for a minute or so, then put it back in.
Being a older trailer from the early 90's though, maybe it has something different. But if you find the furnace vent I talked about on the outside of the trailer, that will be the location of where the furnace itself is on the inside.
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