Do I need to drill holes or modify my bed to install this?

Mounting method isn't specified — test-fit the cover before committing to fasteners or adhesive. Have your truck handy when it arrives so you can confirm the clamp or rail system fits your bed rails without modification.

Can I fold just one panel back without moving the others?

Yes. The tri-fold design lets you flip one section at a time. Fold the front panel back to load from the side, or fold the rear section down if you're only accessing the cab end of the bed.

Does this cover seal tightly or keep dust and water out?

Soft tonneau covers are weather-sealed but not airtight. They keep out rain and major debris, but fine dust may seep in around the folds during extreme conditions. Not a hard tonneau — designed for everyday protection, not water-tight storage.