Best Tonneau Cover for Security (2026): 4 Picks
How we researched this guide We compared four hard tonneau covers on security alone — panel construction, locking design and pry resistance — checking each against its maker’s own documents: BAK’s MX4 attribute and warranty sheets, Retrax’s PRO XR slat and lock specifications, Extang’s and RealTruck’s Solid Fold 2.0 specifications, and UnderCover’s Ultra Flex pages.