Do these mount at the factory rocker points or do I need to drill?

They bolt straight to factory mounting points — no drilling required. Test-fit before final torquing to confirm alignment with your specific truck's door configuration.

Will these stay stable at highway speeds when fully extended?

Manual towing mirrors are solid once latched in the extended position. The manual adjustment means you set them and they stay put — no power motors or vibration issues to worry about.

Do the puddle lights and LED signals come wired and ready to plug in?

The puddle light and turn signal are integrated into the mirror assembly. Wiring routing and connection method are not specified — have a connector assessment done at install to confirm integration with your truck's existing harness.