I would get a DRW truck if I were you. In fact, if for whatever reason I end up getting rid of my current truck, even though I only have a Lance 815 now, I am moving up to a DRW.
Why restrict your future camper choices just to have single wheels? There are plenty of nice campers in the 3k lb wet weight like the 915 you're using for your specs, but why not open the door to the bigger campers if you're changing trucks anyway?
I've never had a dually and I didn't buy one when I bought my current 1 ton because I didn't want to deal with the 6 tires and the parking issues.....but in hindsight it would have been a small price to pay for the stability and GVWR!