Do these mount at factory mirror locations without drilling?

These are designed as direct replacements for your truck's original mirror assembly. Confirm your vehicle's specific mounting pattern before installation — bolt hole positioning may vary by trim level or model year within the range.

Will the mirrors stay stable at highway speeds?

Power-adjusted mirrors lock into position once adjusted. The extended arm length for towing creates more surface area — ensure both adjustment motors are functioning and glass is fully seated before highway use.

What wiring is required to connect the power and heat functions?

Wiring harness integration depends on your truck's electrical configuration. Factory mirror connector may or may not be compatible — test-fit the connector before committing. You may need a wiring diagram specific to your truck's model year and cab style.