This high security welded steel security lockbox mounts under the rear seat in 2007-2018 Chevy/GMC Crew Cab 1500 and 2007-2019 2500HD/3500HD trucks. The full width formfitting design of the Tuffy lockbox has over 3500 cubic inches of lockable storage. Its secured contents are easily accessed by flipping either or both rear seat(s) up and opening the corresponding lid(s). The unique design allows the full width to be used to stow firearms or other long items. Featuring Tuffy's Pry-Guard Locking System with a 10 tumbler double bitted security lock with built in weather seals. Chamfered corners are incorporated into the design for easier passenger access. The innovative mounting system is only accessed from inside the box. When additional floor space is needed the entire lockbox can be removed in seconds without the need for any tools.