Eric, yes, we do have a WD hitch, though I don't know the exact amount of weight that is distributed and would think that 25% might be overly optimistic. We needed to buy our truck well before we got the Airstream, so it wasn't possible to engage in detailed weight measurements before making decisions.
I very conservatively estimated our weight calcs as I like to err on that side and I think we probably could get by fine with the truck you are considering, but we also wanted to build in a larger cushion of capacity and power, should we make any future decisions (kayaks, heavier trailer/5th wheel, etc.) that might involve wanting more capacity.
I think if you are easy with your cargo requirements and use a WD hitch, you very well may do fine with your choice of pickup, which I think is an awesome truck, by the way!
Congrats on your new truck and trailer! I'm sure you are really excited in anticipation.