Will this wing interfere with a tonneau cover or bed cover?

The roof wing mounts to the rear cab area, not the bed itself. Check your specific tonneau cover's rear header design before installation. Most soft covers integrate cleanly; hard tri-fold or roll-up covers may require trimming or repositioning of rear edge hardware.

What are the mounting hole patterns, and will I need to drill new holes?

This wing is designed to use factory mounting points on the rear roof panel. Before installation, reference your vehicle's roof attachment areas to confirm hole alignment. If your roof has been modified or reinforced, measure and verify fitment to the roofline before committing to fastener placement.

How stable is this wing at highway speeds?

FRP roof wings are secured through factory mounting points designed for lateral and vertical load distribution. Proper fastener tightness and full contact with the roof panel are critical to stability. Refer to your vehicle's service manual for fastener torque values, and ensure all contact surfaces are clean and free of debris before final assembly.