I have a 2009 GMC 2500hd diesel. The door sticker indicates a GAWR RR at 6064lbs and GAWR frt at 4860lbs. I am interested in buying an artic fox 811 truck camper with a dry weight of approximately 28...
There are plenty of people who’ve made it work. The issue is tires more than anything else. Some of added lower stable loads. Others have added heavy adjustable shocks like Rancho 9000s. Your level of comfort with the setup may vary.
If you do some searching including the archive, you’ll see many people with a similar setup. If you look at their signatures, some will have details about what they added. Of course, there are also many similar threads.