Does this bolt straight to the factory location?

Yes. This mounts at factory rocker points with no drilling or frame modification needed. Bolt-on installation using existing holes.

Will I need to splice into my brake wire harness?

You'll need to integrate the light into your truck's existing brake circuit. Have a technician verify connector compatibility before purchase—some trucks may require a simple wire adapter.

Is this weatherproof for truck bed use?

The hard panel construction with sealed LED elements is designed for outdoor exposure. Check all gaskets and seals before final installation to ensure water doesn't enter through the mounting points.