Do these mount at the factory mirror locations?

These are direct replacements designed to bolt up at existing factory mirror attachment points. You'll be using the same holes your OEM mirrors used — no drilling or modification to the truck needed.

Will the heated mirrors stay clear at highway speeds?

The heating element is designed to keep the mirror surface clear of frost and condensation during normal operation. Wind chill at highway speed will reduce heating effectiveness, but the mirror will remain more usable than an unheated unit in winter conditions.

What do I need to wire these into my truck's electrical system?

These mirrors require connection to your vehicle's power and ground, plus a separate connection to activate the heating function. Exact wire routing and relay specifications depend on your truck's factory wiring — consult your vehicle service manual or a professional installer for proper integration.