Will this work as a direct bolt-on replacement for the OEM mirror?

Yes — this assembly uses factory mounting points. No drilling or modification needed. Bolt it in place using existing holes.

Do I need to run new wiring for the LED signals?

The assembly includes the LED signal bars, but wiring harness routing isn't specified in the product data. Verify electrical connection points before installation to confirm compatibility with your truck's existing signal circuit.

Is this mirror significantly heavier or lighter than the OEM unit?

Weight isn't specified. Since the LED signals are integrated into the assembly, overall weight may differ slightly from a basic steel mirror. Test-fit before committing to mounting to ensure the bracket handles the load.