Will this fit under my seat without blocking pedals or seat movement?

This is designed for under-seat installation at factory mounting points — it won't interfere with seat slide rails. Test-fit before final placement to confirm clearance with your specific cab configuration.

Do I need to drill holes or permanently modify my truck?

No drilling required. The box mounts at factory points, so you can remove it anytime without leaving marks or damage.

What can I safely store in here?

Tools, jumper cables, emergency kits, registration docs, anything you want locked away from weather and eyes. Keep weight reasonable — this isn't a load-bearing platform.