Do these mount at factory rocker points or require drilling?

They use factory mounting points — no drilling needed. Bolt them in with basic hand tools and you're done.

Will these interfere with aftermarket wheels or suspension lifts?

Step bars sit low on the frame. Test-fit is still smart if you're running aggressive offset wheels or have significantly modified your suspension geometry.

Does the silver finish need prep work before install?

No prep required. Install straight out of the box. The finish is ready to go.