Will these stay stable at highway speeds with a loaded trailer?

These are engineered for towing duty and designed to hold their position under load and wind pressure. Once power-adjusted to your angle, they stay locked in place during normal driving conditions.

Do the mirrors use the factory mounting holes?

These are designed as direct replacements for the OEM mirror setup, so factory mounting points apply. Test-fit before final installation to confirm alignment with your truck's door panel.

How do I wire the heating and power functions?

Wiring harness connections are required and will tie into your truck's electrical system. Refer to the installation instructions included with the mirrors—if custom routing is needed, have an auto electrician verify your setup.