Will this mirror stay stable at highway speeds?

This is a direct OE-style replacement designed to match factory mounting and bracing. As long as it seats fully at the mounting points, stability mirrors that of original equipment.

What's the mounting hole pattern, and does it line up with factory holes?

Designed for factory mounting points on Ram trucks in this generation. Test-fit before final fastening to confirm alignment with your specific vehicle's attachment points.

Does the heated element come wired, or do I need to splice into existing wiring?

Mirror assembly includes the heating element. Exact wiring configuration not specified—check your vehicle's service manual or have a technician verify the connection points before powering on.