If your equipment cache includes such things as portable torches, Stanley Tools and other heavy wheeled pieces, then why struggle with attempting to load it above the frame rail? Why not down low where it can easily and safely be deployed?
The 40” to 42” deep floor level compartments easily accommodates this type of equipment and can be wheeled directly into and out of the compartment.
Incorporation of a drop-down ramp that stores just inside the door opening facilitates loading. The ramps are removable, allowing it to be relocated to other compartments.