If you have room behind the tail lights, I would go with separate bulbs. That way you completely avoid messing with the factory wiring. I did have room, so I carefully drilled holes into the tail light modules of the right size for the bulb sockets, put a little silicon sealant around the sockets and wired them up. You can't tell they are there.
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USN, Retired
2020 Grand Design Momentum 25G
2022 Silverado 3500, 2007 Honda Goldwing
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