The trailer lights are powered through a separate circuit (at least a relay or 2) that is only powered up when the key is in the 'Run' position.
You'll probably find the running lights, turn signals and brake lights behave the same.
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TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!
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