Do these mount at the factory mirror points?

Yes, these are designed to use OEM mounting locations — no drilling or bracket fabrication required. Install them where your stock mirrors bolt on.

How do I wire the power and heat functions?

Wiring harness routing and connections vary by truck. Run power through the door panel to your battery or fuse block, and tie the ground to a solid frame point. Consult your vehicle's factory service manual for exact routing and wire gauge specs.

Will the mirrors stay stable at highway speeds?

Towing mirrors are built for high-speed use and trailer hauling. Wind buffeting and vibration are normal in any mirror; if you notice excessive play after install, verify all bolts are tight and mounting hardware hasn't come loose.