This Security Enclosure by Diabolical would be a good idea if you plan on taking the hardtop off. They also have several add-ons (molle panels, rails) that work with it.
Slipstream Security Enclosure Features:
Secure your valuables out of sight when you're away from your vehicle.
Works with Hard Top and Soft Tops.
Easy to install, and remove.
Durable enclosure frame is constructed of steel, and the box is made from thin gauge aluminum and fully powder coated to protect the surfaces.
Integrated design to optimize the entire cargo area eliminating any dead space and offer a factory finished look.
Flexible design to accommodate your needs - access door behind back seats, removable cover and fold-down forward wall when carrying oversized cargo
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Slipstream Security Enclosure Features:
Secure your valuables out of sight when you're away from your vehicle.
Works with Hard Top and Soft Tops.
Easy to install, and remove.
Durable enclosure frame is constructed of steel, and the box is made from thin gauge aluminum and fully powder coated to protect the surfaces.
Integrated design to optimize the entire cargo area eliminating any dead space and offer a factory finished look.
Flexible design to accommodate your needs - access door behind back seats, removable cover and fold-down forward wall when carrying oversized cargo

Slipstream Bronco Security Enclosure - (4 Door)
Drive top-down and worry-free. With the Slipstream Security Enclosure, only YOU can get into your cargo area! Our powder-coated steel and aluminum locking security enclosures offer an integrated, factory finished look. Lock your gear or valuables out of sight while away from your vehicle.
