Payload for 2016 Ram 2500?? What am I missing??

I thought the 2500 would give me a lot more cargo capacity, in case I wanted to swap to a larger trailer.

I guess the Ram 2500 is a heavy grocery getter. Technically, the capacity is a full ton, for the 3/4 ton - so can't complain exactly. But it costs A LOT more than the 1500, and only 500 lbs difference between the two? What gives

Here's some stickers from a '16 Ram 2500 Tradesmen with (yech) 20" low profile tires / rims





Album link in case the pictures don't show up