Wow, there are some uninformed folks throwing out info in here today...
1) as of 2013, the Ram 2500 and Ram 3500 do not use the same frames. The suspension is also different as the 2500 is coil springs. The rear frame sections are different.
2) I get better fuel mileage in my 2014 3500 DRW than I did my 2005 2500 SRW... the ones with poor mileage were the non- DEF trucks (before 2013)
3) please provide back up that the DEF system has been trouble prone on the Rams. Chevy had a rash of DEF issues in 2011... I have been a member of the TDR for many years and maybe have heard of a couple DEF issues on the Rams... I have had no problems with my 2014, and I have 3 friends with 2013+ trucks and none of them have had a lick of issues with DEF either.
OP... enjoy the truck... you will be pleased... don't freak out about the emissions system on the 2013+ trucks... they are proving to be quite reliable.
2014 RAM 3500 4x4 CCLB Dually, Cummins / 68RFE / 3.42 / B&W Patriot 16K
2016 Coachmen Chapparral 360IBL
SOLD - 2012 Salem Cruise Lite 281BHXL
SOLD - 2005 Dodge Ram 2500 4x4 QCLB Cummins