Do I need new hardware to mount this, or does it use factory bolts?

Factory bolts work, but confirm torque specs in your vehicle service manual before final tightening. If fasteners are missing or corroded, replacement hardware is a standard hardware store run.

Is a wiring harness included for trailer lights?

Wiring harness sold separately. You'll need the connector kit matched to your vehicle's electrical setup to complete the installation.

Will this require undercarriage modification or drilling?

No drilling — mounts directly at factory attachment points. Test-fit under your vehicle first to confirm clearance with existing components before final bolt-down.