As noted in my Signature, I have a Ram 1500 EcoDiesel. And, from the others, you want either 4X4 or you will need a driveshaft disconnect installed. Also, not sure what you're looking for, but the EcoD is available in Std Cab 8' bed, Quad Cab (extended) 6.4' bed, and Crew Cab 5.5' and 6.4' bed. Unfortunately, it is not available in Std Cab 6.4' bed.