If it is too tight it might rub or bind between cab and bed. I've seen fingers pinched between top of bed front and cab when truck flexed a little on straight trucks. I measured 2 straight stock unhit trucks just now. 1st is a 71 3/4 ton 2 wheel drive, gap measured 13/16th - 7/8". 2nd is 72 1/2 ton , 2-wheel drive measures 7/8- 1 1/4". Neither variation is noticeable. I would set in this range and try to get it as even as possible.
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Bob
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