A "switch to change from electric to propane" ???
What appliance or what "system" are you asking about???
There is no "switch that operates everything in the trailer to change from electric to propane".
The individual appliances, if they are "gas/electric" will either have a dual operation capability (such as the water heater) or an automatic/manual changeover capability (such as the refrigerator). Then, there are some appliances that use both "electric and gas" such as the furnace.
If you could give more specific details about what you're asking, someone could provide you with a much better answer about the system/appliance you're trying to operate.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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