Do these mount at the factory towing mirror attachment points?

Yes. These bolt directly to the existing mounting holes on your mirror housings — no drilling or relocating fastener points needed.

Will these lights work at highway speeds without vibration or rattle?

They're designed for factory-point mounting, which keeps them solid. Tighten fasteners firmly and they'll hold steady under normal towing conditions.

What wiring do I need to connect these?

Wiring harness details are not specified — you'll need to verify compatibility with your mirror circuit or consult your service manual for splice points and wire gauge.