Keep it - such low mileage.
If you upgrade go to a 2012 or newer. 2011 model is having more emissions issues.
Some additions
Bilstein shocks (OEMs are shot)
Isspro gauges (boost and pyro)
Luverrne SS running boards - great running boards
Allison deep pan (runs cooler and TranSynd fluid change)
PML diff. cover
Silverline 4" T304 SS CAT back exhaust - will run cooler and sound better
LT265/75R16 tires (3400 lb capacity)
Air Lift air bags (take the sag out of the truck)
I added all of these to a 2004 3/4 ton I owned.
Would not add a tuner without a tranny upgrade.