It is omitted for some reason in the manual but nevertheless it does exist. Here is a picture of a 52 survivor truck that just underwent a cab off. Seem to remember GMC used a longer bed on their 1/2 tons and had a carrier being didnt they?
GMC had a "long bed" 1/2 ton model (Chevrolet did not).
GMC had an "extension joint" to extend the enclosed driveshaft.
