The Ram box take away the load you can care. You will be fine. and man why the 3.21 gears. Way to low to tow in my mind. My 3:55 suck in my mind.
My Mods
http://tuftruck.com/products/dodge
BullyDog tuner
http://www.truckspring.com/suspensio...mbren-kit.aspx Bump stop helpers
Rancho 9500 rear 10 way shocks
Rancho quicklift with 9500 shocks.
Slotted Front and rear rotors
better pads
etc etc. Above is a good start. problem with 2012 and up are the front diff is welded so you can't change gearing..
I pull my trail level even with the 2 1/2 lift in front, and tow my 35 foot in closed car trailer full loaded with no issues