Will these bolt to factory holes, or do I need to drill new mounts?

These are designed for factory mounting points on the Ram — no drilling required if your truck has the original mirror brackets intact.

Do the mirrors stay stable when towing at highway speed?

Manual mirrors are solid once mounted; they don't vibrate or shift like aftermarket clip-ons. Mounting torque and tightness matter — follow your truck's service manual for fastener specs.

What hardware comes in the box?

The mirrors themselves are included. Mounting bolts and fasteners are not confirmed — verify your truck's original mirror hardware is reusable before ordering, or source fasteners from a Ram parts supplier.