Brian that looks BAD 
but i think the diamond plate would work well but get the thinner stuff like 14 gauge maybe, 1/8th inch would be a little hard to bend. but cut out the bad and over lap putting the new under the old. this way it supports the old and if you hit hard it doesnt simply rip the body mount up into your leg. trace it out onto some old cereal box then transfer that to the steel.
Can you pull the cab?? or unbolt all six mounts and run some 2x4 or 4x4 under the cab over the frame maybe.
Yeah my heart dropped a little when I saw how bad it was. I think I'll prop the cab up with a 2x4 and put in the new plate underneath. Passenger side is the same story, not quite as bad but bad enough.
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