OP you will be fine. No reason to get a dully.
Hope you enjoy your new truck. You will have to wait for the truck for about 45 days but it's worth the wait to get what you want. The 19 M/Y may even be a better truck.
I have the B&W hitch. You will be happy with that hitch. I also got a side step from these guys
http://www.amp-research.com/products...tep2%e2%84%a2/