I have a similar truck with the 5.7 hemi.
I just lock out 5th gear and it pulls great, runs around 2500 rpms.
I also moved up from a 1/2 ton and the towing is enjoyable now.
2012 Jayco Whitehawk 28DSBH
2011 Dodge Ram 2500 5.7 Hemi
Previous camper-2010 Starcraft Travel Star Sport 175RK
Previous TV-2008 Ford F150 XLT Supercrew 4x4