I always like to take the path of least resistance. Rather than going through the pain staking exercise of wiring, splicing, and maybe making a mistake along the way, also interfering with your truck wiring, why not just get something like this? If it were mine, this is what I'd do:
Click here
or
Click here, slightly higher cost though.
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2019 Montana High Country 375FL Fifth Wheel
2014 Chevy Silverado, 3500 Dually, long bed, crew cab
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