The good news is this thread and this forum stopped me from making a mistake. I sold my Grand Cherokee because it wouldn’t pull my enclosed car hauler well with the family all on board. It’s payload in Overland trim was 1100. I was all set on getting a Longhorn with air suspension, RamBoxes, panoramic roof, 33 gallon tank, and Off road group. I even had a dealer have their commercial sales guy work up payload numbers for me when I insisted it wouldn’t be the 1,800 number. He came back with 1,560 - which this thread has absolutely proven impossible.
‘’The bad news is this information has driven me to Ford. I’ve checked the stickers on several King Ranch and Platinum models with the same options as my Longhorn build (except Ramboxes and Air suspension, of course) and all had payload ratings higher than 1500. So either I can have a Ram or I can have the options I want. Or I can have a 3/4 ton Ram or a 1/2 ton Ford. I’m not a brand champion for either, but it certainly looks like leaf springs make a big difference in payload while coils make a big difference in softness of ride.