+1 with the requirement for a sub-frame to deal with the issue of torsional stress on both the box and the chassis rails.
The sub-frame would need to be pretty substantial to support the comms box and you'd have to ensure at least the same amount of articulation as with the standard bed was designed in.
I reckon you could build a structure that was slightly lighter and lower than the original bed (both useful attributes) but whether it's worth all the effort is another question.
The standard comms box is not light and it's doubtful that the built and loaded vehicle - even with no sub-frame - would come in at under 7,500kg.
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