Does this mount to the factory bed rails or does it need drilling?

It's designed for factory mounting points — no drilling required. Test-fit before final installation to confirm alignment with your specific truck's bed configuration.

What do I need to install this, tool-wise?

Basic hand tools and a helper make the job easier. Mounting hardware method is not specified — verify what fastening system your tonneau uses before you start, or contact support for the install sheet.

Can I leave this rolled up in the sun all summer without damage?

Roll-up tonneau covers are built to weather sun and rain. Store it rolled or unrolled — just keep the mechanism clean and dry. If you're parking it long-term uncovered, rolling it closed protects the bed and seals better against dust.