2005 2WD 2500 Ram Crew Cab HD SLT SB Auto Cummins

You need to look at the CCC not just the GVWR. With a diesel and crew cab, your truck is somewhere in the 7000 to 8000 pound range without passengers or cargo. That leaves you with maybe 2000 pounds CCC? That is way less than what you will need for a typical 8 foot hard sided camper. In addition to the CCC issue, you have a short bed truck. That makes carrying a camper even more difficult. The center of gravity needs to be several inches forward of the rear axle and that is difficult with a short bed.