Do these mount at the factory mirror points with no drilling?

Yes — these use factory mounting locations. No drilling or modification to your truck's body is required.

Will these stay stable and vibration-free at highway speeds?

Factory mounting and rigid construction are designed to hold position at full speed. Test your angle adjustment before hitting the freeway to confirm lock-in.

What about the electrical connection — do I need to splice wires or run new harnesses?

You'll need to connect the power and ground leads to your truck's electrical system. Routing and connection method depend on your specific setup — check your vehicle's wiring diagram or consult a professional installer if you're unfamiliar with automotive electrical work.