Re: 79' K20 with 1-Ton rear brakes from factory??
Years ago, I worked with a guy that special ordered a 75 3/4 ton with a 1 ton rear axle because he was going to set it up with a 5th wheel hitch for his travel trailer. Possible yours was ordered or modified for similar duty. That was a time when you could do a lot of special options on a custom build truck.
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