I love my old 2005 Dodge 3500 SRW and have bought from each of the big three- they all make good trucks. If I were buying something to tow your 5er I'd go with the 2017 F450 4x4, widetrack front end is a huge boon.
The Dodge Crew Cab introduced in 2010 is far bigger than the previous QC. I prefer the QC, but the CC now stacks up against the GM and Ford offerings.
Most reliable truck I ever owned was my GMC Duramax, never had an issue. The Cummins is as stout as they get but Dodge electrics and seals are another matter, the latest Ford Powerstroke seems to run well but boy does that name have a f'ed up history.
Edited: autocorrect made my term incorrect-- changed widetrack to sidetrack, now corrected.