2014 Ram 1500 Engines and Fuel Economy - MSN Autos
SLT Quad Cab 4x2 Curb Weight is 4900 pounds.
This is for a base truck with no options added (v6 engine).
The 5.6L Hemi adds about 500 pounds to the base truck.
So, with a full tank of gas and a 150 pound driver you should be in the neighborhood of 5400 pound (Conservative because of other options not known).
SLT Quad Cab 4X2
Passenger Volume (cu. ft.) 116.60
Cargo Volume (cu. ft.) No data
Standard Towing (lb.) 4400
Maximum Towing (lb.) 8200
Standard Payload (lb.) 1890
Maximum Payload (lb.) 1890
Standard GVWR (lb.) 6700
Maximum GVWR (lb.) 6950
Add 200 pounds for passengers, 150 pounds for hitch, 50 pounds for "sodas and snacks" you have a "notional" curb weight of 5800 pounds.
With the standard GVWR of 6700 pounds, you have a remaining available payload of 6700 - 5800 = 900 pounds for pin weight.
900/.2 = 4500 pounds of 5th wheel (like THAT is ever gonna happen)
However, a 900 pound tongue weight travel trailer can weigh 7500 pounds.