Will this mirror stay stable at highway speeds?

Towing mirrors are engineered for full-speed highway use with trailer loads. Stability depends on proper installation at factory mounting points — ensure all fasteners are seated and tightened per your vehicle's service manual.

Does the heating element work independent of the engine running?

Heating function is wired to your truck's electrical system and operates whenever the ignition is on or the system is activated via dash control — it does not require the engine to be running.

What mounting hardware comes with this mirror?

This assembly is designed for factory mounting point installation. Confirm your truck's mounting bolt pattern before purchase; additional fasteners may be required depending on your existing hardware condition.