Close. 4x4 Tradesman. http://en.wikipedia.org/wiki/Dodge_Ram#Payload_capacities Most these decks run around that 400lbs. Depending on the sled, I say 550 max x 2 = 1100 lbs + 400 = 1500lb payload. And if your splitting hairs over a few hundred pounds you best not see what people that use pickups to haul and work with do with there trucks.....
I love a person that quotes wikipedia for anything. how bout this instead http://www.ramtrucks.com/shared/pdf/2012_RAM_1500_4x4_Trailer_Tow_Chart.pdf
you're looking at a best case scenario. I'm looking at a more average scenario. hence I included driver and passenger and gear.
and as a contractor I've overloaded my truck every time I've towed with it. but its prob never gone more than 2 or 3 miles from jobsite to jobsite FWIW.
i just think people should have a real world expectation of what they are doing. not a best case situation.