I had a 42' 1.5 ton military that had side brackets inside. You could lock the window in any position. I have never seen them on civilian trucks.
'36 Tall cab Chevy 1.5 ton, '36 Low cab Chevy 1.5 ton, '53 GMC 2 ton, '51 GMC 640 5 ton, '47 Dodge 2 ton, '42 GMC CCKW 353 6X6.
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