Will this fit my vehicle without drilling or permanent modification?

Mounting method not specified in product data — test-fit before committing to adhesive or fasteners. Some vehicles use factory roof points; others require aftermarket clamps. Confirm your roof type before purchase.

Do I need to seal or treat the aluminum after installation?

The silver finish provides corrosion resistance out of the box. If you're installing in a salt-heavy environment, inspect connection points periodically and apply touch-up sealant if any bare aluminum shows.

What's the weight capacity, and can it hold a cargo box?

Load capacity not specified — check your vehicle's roof load limit in the owner's manual, then verify against any cargo box weight. The rack itself is aluminum, so it's light, but your vehicle's structural rating always comes first.