Towing is a tow part consideration. I suspect with your 17000# max on the truck you are in a single rear wheel truck and a 3.55 or 3.42 axle.
A 16000# 5er will have a loaded pin weight of about 3200#. you have to look at the payload capacity of the truck. Add the pin weight ( not brochure dry weight) plus the 5er hitch, any truck cargo and passengers for a total weight. This has to be less than the trucks payload or cargo capacity.
If you are out west, you will want a 3.73 rear axle or a 4.10 axle for mountain towing. I would look at a diesel 1 ton dually.
Ken