Do these mount at factory rocker points or require drilling?

These bolt to factory mounting points — no drilling needed. Use factory hardware and torque per your vehicle's service manual.

How do I wire the power and heating functions?

Wiring harness routing and connection points depend on your truck's year and existing electrical layout. Have an installer or electrician verify polarity and relay configuration before powering the mirrors on.

Will the mirrors stay stable at highway speeds?

Factory-style mounting and construction are designed to handle OEM-equivalent loads at speed. Ensure bolts are torqued to spec and the mounting surface is clean and free of damage.