After looking at one ton trucks with dually wheels, I prefer the one ton trucks with single rear wheels. What would I be giving up not getting the dually wheels?
The pin weight of the 5er is the primary issue of DRW vs SRW. They have really boosted the carrying capacity of the newer trucks. But there still comes a point where you need the DRW due to heavy pin weights. Check the payload ratings of the truck(s) of interest and then see if it is enough to carry your 5er.