I agree you should stop by a scale loaded and see what the numbers look like.
My guess is your horse friends want you to buy a DRW. That's probably what they drive, right? If you can get by the rest of the time with a DRW, buy the DRW.
If you need a SRW for the rest of the time, buy a 350/3500. There really isn't a lot of reason to buy the 2500 or another Titan. A DRW will give you more flexibility for the future when you decide to upgrade your truck camper or pull a heavier trailer. A heavier truck will be more stable.
They probably want you to buy a bigger truck camper, too. When are you going to do that? :)