Don't forget if you have dual A/C controls Heater Treater will convert it to single controls. I plan on using a combo of both HT and Mopar on my Laramie. From their website:
Dodge Ram 2002, 2003, 2004, 2005, 2006, 2007, 2008, blend door auto AC heat replacement part
(If your RAM is dual control(separate control for passenger and driver’s sides) the HeaterTreater will connect the blend doors together and convert the system from dual control to single control from the driver’s side knob. The back motor that controls the passenger side blend door is only accessible if the plenum box is removed. For a dual control RAM, this is a compromise between repair difficulty/cost and functionality. For the single control, the system will operate exactly as it did when new. )
Shadrach