Do these bolt directly onto my existing mirror brackets?

Yes. These mount at the factory attachment points — no drilling or bracket fabrication required. Test-fit before final torquing to ensure alignment with your specific truck.

What wiring does the heating system need?

Powered heated mirrors require connection to your truck's electrical system. Wiring harness and relay integration specifics are not confirmed — have an electrician or shop verify compatibility with your vehicle's power distribution before installation.

Will these mirrors stay stable at highway speeds while towing?

Factory-style mirrors are engineered to OEM stability standards. At towing speeds, proper adjustment and secure mounting at factory points keep vibration minimal — ensure all fasteners are fully seated before hitting the road.