Normally, if something is burning it is because of some type of short, loose connection, insulation that the chaffed, etc.
There is a also usually an increase in amperage because of the short. I would first disconnect 120VAC and see if the smell goes away. If so, then put an amp meter (clamp on DC is best) on the 12V line from the battery, turn everything off, then measure the current. Most trailers, including mine, read about 0.5 amps with everything turned off. Then start turning things on and see if anything stands out as an unexpectedly high current draw.
You can do the same kind of troubleshooting with the 120V AC power buy clamping on an AC amp meter and turning on the breakers 1 by 1.
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2015 Jayco 27RLS
2015 Ford F250 6.7PSD
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