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

No — this tonneau mounts directly to your factory anchor points with the hardware included. No bed modification needed.

Can I use this tonneau with a tonneau toolbox already in my bed?

Depends on toolbox height. The tri-fold design needs clearance against the cab when collapsed. Measure your toolbox height and test-fit before committing.

What's your return window if this doesn't fit right?

Check the returns policy on your order confirmation or contact support with your order number — they'll walk you through the options.