GVWR = Gross Vehicle Weight Rating
GCWR = Gross Combined Weight Rating
GCWR is the weight of your vehicle, occupants, gear, fuel, food, water, waste etc PLUS the weight you are towing.
2000 Dodge B3500 Ram Maxi Van 5.9 V-8 8400 lb
Note that this is under ideal conditions and assuming you have 4.10 gear ratio. Tongue weight is limited by GAWR and hitch rating. Over 2000 pounds a weight distributing hitch is recommended. Electric brakes are required after 1500-2000 pounds (depending on jurisdiction).
Disclaimer - The above information may or may not accurate. Please contact a Dodge dealer for updated or corrected information.