Thanks folks. So 32 seems the way to go.
Now what about load rating. A pair of 2,800 pounders is right at my current GVWR. 3,500 would buy me a little room. I am leaving it stock and not changing a thing as far as Cabernets and Counters, layout, and my new plastic fridge is lighter than the original. I have hit the truck scales a few times while loaded and I am always right at about 5,200-5,400 when loaded for a trip with full water tank.
Do the heavier axles comprimise the ride quality? Should I just stick with the 2,800. I am not worried about having bigger brakes since my tow vehicle is well equipped to stop.