Do I need to drill into my bed rails to install this?

Installation method is designed for standard truck beds. Verify your bed's condition before mounting — if you have bedliner or non-standard modifications, test-fit first to confirm clamp or fastener compatibility.

Can I fold this cover open while driving, or does it need to be fully closed?

Tri-fold tonneau covers operate best when fully closed or fully collapsed against the cab. Partial-fold while driving isn't recommended — secure it one way or the other before moving the truck.

Does this come with clamps or fasteners?

The tonneau assembly ships complete. Confirm what mounting hardware is included in your shipment — if you need additional fasteners or weatherstripping, contact support with your order number.