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I had a 43 GMC 6x6 and it would cruise at 55 no problem all day, until you got to a hill. We have a few hills here in Conn. where she'd get down to 15-20 MPH, but would climb them. The trucks were never made for speed, and were designed for off road use on undeveloped roads. Their weight capacity was also cut in half. A 2-1/2 ton trucks load capacity was 2-1/2 tons of cargo off road, 5 tons over paved roads. A truck like yours was never considered for "Combat use", but for on base use.