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Tim,
Can't answer your question other than to say GM (not that familiar with the others) publishes the numbers in the brochures, on line, etc, for a best case scenario from their point of view. Thus the cargo rating is for the small gasser, because that lets them honestly put that big cargo capacity number in the document. If they put the cargo capacity of the D/A it would be 750 less because the weight of the engine comes off the cargo capacity. Of course that's very deceiving to us, because to do any serious towing the 6.0L won't work...not enough engine or GCWR.
Here's another confusing issue. When I was researching trucks, I visited a half dozen Chevy/GM dealers as well as Ford and Dodge dealers. All GM 3/4s have GVWR of 9200...Ford/Dodge have lots of GVWRs. Anyway, the GMs were all around 2300 to 2400 in cargo capacity for 4x4, cc, D/A; looked at a 3/4 Ford PSD, 4x4, cc with a GVWR of 10000. What was interesting was that the cargo capacity of the Ford was only 2507 (off the sticker). Bottom line, the Ford was about 700 heavier than the GMs.
As for ordering a truck...you can get good valid information from the above mentioned sources for everything (GVWR, GCWR, max towing, etc) except cargo capacity. For that you have to look at the sticker on the left rear door. If you were going to actually order a truck, you'd have to get that information from a similarly equipped truck.
They certainly do not make this easy!
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