Do these bolt to existing factory holes?

Yes — these mount at factory rocker points on extended cab trucks, so no drilling or frame modification required. Use the existing bolt locations for a clean install.

Can I keep the chrome shiny or does it need maintenance?

Chrome holds its finish in normal conditions, but salt and moisture will spot it over time. Rinse regularly if you're in a coastal area or during winter salt season; a coat of car wax every few months keeps it brighter longer.

What's the weight capacity on these bars?

Weight capacity isn't specified in the product data — test-fit one side before you fully commit to installation, and keep your full body weight centered on the platform when stepping up or down.