Do these bars need any drilling into the roof?

No. These mount directly at your Tucson's factory roof points — no holes to drill or roof damage.

What kind of cargo can these support?

They're engineered to handle standard roof racks, boxes, and crossover carriers within your vehicle's roof weight limits — check your owner's manual for max load capacity.

Will I need additional fasteners or hardware beyond what's in the box?

Mounting hardware is included. If you're adding aftermarket racks or carriers, verify their attachment method matches standard crossbar slots to avoid surprises during install.