There were improvements made in 2012 to the integrated brake controller. The 2010/11 models did not have the light/heavy trailer options and many folks who towed "heavy" (trailers in excess of 8000 lbs) did not like the controller. My brother owns a 2012 Dodge 2500 with the improved brake controller and tows a flat bed trailer loaded with a farm tractor ~13,000 lbs and no trouble stopping.
Steve, Christy, Anna and Scout (Border Collie)
1994 30'11" Excella - rear twin
2009 Dodge 2500, 6 Speed Auto, CTD, Quad Cab, Short Bed
Hensley with adjustable stinger
WBCCI # 3072
AIR # 6035