Will these bolt directly to my truck without any drilling?

Yes—these mount at factory rocker and door panel attachment points. No holes to drill, no brackets to fabricate.

Do the heated elements work independently, or do they turn on with the ignition?

Heating function is wired into your truck's electrical system and operates via the mirror control switch. Refer to wiring diagram included or your vehicle's service manual for integration details.

Will these mirrors remain stable at highway speeds?

Hard panel construction and secure OEM-point mounting keep mirrors rigid under load. If you experience vibration, double-check all fasteners are torqued per your service manual.