Look at your driver door jamb
You will see two stickers.
One lists your axle amd vehicle ratings.
One will list your payload.
A 2500 has a gross vehicle rating of 10000 lbs.
Your gross axle rating will be listed there as well.
Take your payload rating from your other sticker and subtract it from your GVWR to fet base weight
For instance my truck has a payload of 2998.
My base weight would be 7002.
Your Cummins will be about 900 pounds more than my truck.
So as you can see...you dont have much payload for a truck camper.
But, I always hear people talking about how you can ignore GVWR on a 2500 and just go with gross axle rating. (This isnt always right, but isnt wrong) My rear axle is 6500lbs.
Look at the chart to get your base weight for configuration. Just remember the numbers they give are for a base tradesman.
Or even easier. Go to a CAT scale and weigh it. Then you will know for sure.
The 6000 lb trailer is well under the tow rating...but the camper will probably leave you with no payload for the tongue weight.
Note: sorry, was gonna post the chart but my phone isnt letting me access my sd card.
Just search for 2017 RAM 2500 payload and towing chart then download it.