What is the GVWR and curb weight on the truck? That will give you payload. Once you know that, subtract a minimum of 500 lbs (for you, the hitch and a passenger or some gear). That will give you what pin weight you can carry. Once you know that, multiple any advertised pin/hitch weight you see on a manufacturer/rv dealer site x 1.25 to get a guesstimate of what the real pin weight is (advertised dry weights are notoriously under the real weight with options).
Current TV:'14 F350 Lariat CrewCab, 4x4 Short Bed SRW Diesel w/ Pullrite 2700 (16K)
Current Fiver: '15 Puma 295BHSS Anniversary Edition
Past TV: '13 F150 HD Payload SCrew EB, '08 Tundra CrewMax 5.7L, '02 'Burb 5.3L, '97 Dakota 3.9L
Past Trailers: '09 Wildwood LE 27RB, '02 Palomino Yearling RL, '87 Jayco 1006dlx