Cannot address the GM load capacities but I can address the notoriously incorrect factory Rockwood weights.
My dry weight was listed as 6850 with a gross of around 8500. Cat scales indicated a loaded weight of 7500 with maybe 200 pounds of gear in it. Full propane tanks and all water tanks empty. I seldom carry any water anyway but if I did and each of the three tanks were 2/3 full I would be right at gross for our RV.
The kicker was my tongue weight. It was listed as 951 dry. Cat scales indicated over 1200 pounds. I was so concerned with the tongue weight that I ordered a tongue scale to weigh it myself. It consistently weighs around 1100 pounds. I cannot explain why the cat scales weighed the tongue heavy but I got the point. My tongue weight was way heavier than what they listed. Max weight on my Tundra was listed as 1450ish so with my wife and I on board and a couple of suit cases and groceries we are right at gross for my truck.
Point is, do not trust the factory listing for weights. Get it weighed so you will know what you are working with. This is important.....
The dealer installed a Equalizer brand hitch rated for 10,000 gross/1000 tongue weight. Once I had the weight ticket I was able to go back to my dealer and they swapped out my hitch for a 12,500/1250 hitch at no cost to me. The lighter weight hitch might have been adequate but needless to say I was not happy that they let me pull our trailer off the lot with a hitch that was lighter duty than Equalizer recommended. Also, the dealer did not set my hitch up correctly. After talking to the good folks at Equalizer it was as simple as adding a couple of additional washers to transfer more weight toward the front axle of my pickup. It runs perfectly level going down the road now.
Oh yes, the other thing is that had I known that the hitch weight was so heavy on mine then I might have gone with a fifth wheel. You buy a trailer planning on one weight and you just do not know what you have until you get it weighed.
Max trailer weight for my Tundra was listed as 10,600. So, I am under that weight but as explained above that is not all that I have to keep in mind. I have never had any problems with power or with the handling of that much weight but I just have to always remember that I am very close to max cargo on my truck.
100% happy with ours though........
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