The Tank trolley is not a tool storage cart, it's more for taking tools and parts to the car. I am using it for bodywork tools and carting my Plasma cutter to the vehicles.
Security is not really needed, noting of much value is store in this space. The car being worked on will be in here, but the property is walled with lockable gates. Behind the 3 doors in the wall is where all the things are stored. The tool carts, welders, parts, lathe etc. are wheeled in there and locked away.
With our wheather, we need wind protection during winter and lots of ventilation during the hot summers, the temps reach 35 Celsius regularly and sometimes 45 Celsius, then time for
Rgrds