Do I need to pull the entire bumper to swap this out?

No—access is from the back of the housing. A few fasteners hold the lens in place; you can get to them without removing bumper or tailgate. Takes about 10 minutes per side.

Will this work with my truck's factory wiring harness?

Yes, it's designed as a direct replacement for the OEM lamp—same connector, same mounting points. Plug it in and you're done.

Are both lamps included, or just one?

Confirm your order quantity before checkout. These are typically sold individually, so order two if you want to replace both sides.