There's not a lot of structural rigidity in the comms body. It's mostly aluminium and designed to sit on the quite rigid flatbed of the truck. You could remove the flatbed headboard to reduce weight a bit, but I think if you try to mount the body direct to the chassis you won't get the rear door open unless you're parked on the flat! Building a fairly rigid subframe that's lighter than a full flatbed might be possible - large section thin walled box section? Then fix this to the chassis in such a way as to minimise torsion...
Good luck. Alternatively, take the class C licence and don't worry about weight? (This is assuming you're trying to register as a sub 7.5 tonner of course)
Simon.
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