In reference to using the 2.5s for gun trucks. They would not hold up long mechanically as was discovered in 'Nam. The frames broke when they were armored up and got heavy ordnance, hence the switch to 5 tonners. I'm sure you'd see some, but the heavier truck is much more preferred from experience. And IF you are going to go to the trouble to armor a vehicle, why not do it to a vehicle that can take the mechanical punishment than run the risk of a breakdown with the sub-standard one?
Just my 2 cents and change.
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