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My first truck had a/c installed in it when I acquired it. It only had the default cab insulation kit. Why didn't it come with additional insulation? I never asked the seller so you'd have to ask him. I got the impression he wanted to keep it as stock as possible (he had a nice collection).
My first truck had a gen1 OEM a/c and it was "meh". It was cooler but never cold.
I sat in a truck with a gen2 a/c and it was a world of difference (both no insulation, btw).
Now what those OEM Red Dot unit's put out, I'm not sure. But a HMMVW unit is 24K BTU and by many accounts it don't...
Something along these lines would be better suited. Again, a bit of sheet metal work to make it fit like OEM or just mount it in the back of the cab.
https://www.ebay.com/itm/264706381764
https://www.ebay.com/itm/254435681460
https://www.ebay.com/itm/264566035395