1972 K2500 camper capacity

[peegeez]

I have a 1972 GMC K2500 with a Dana 44 in front and a Dana 60 in the rear.
350 V8, SM465 & NP205 with 4.10 gears.

I have converted to discs in the rear.

The Dana 44 is rated to carry 3,500 lbs and the Dana 60 is rated to carry 6,500 lbs. For a total of 10,000 lbs. I weighed my truck at a scale and it weighs in at 4700 lbs.

So, 10,000 lbs - 4,700 lbs = 5,300 lbs
Tires and rims weigh 300 lbs so I have 5,600 lbs of capacity.

How much of that can I safely use for a camper?

The truck has been entirely rebuilt from ground up. So, everything is new and in good working order.

Any comments or info would be appreciated.