I was in Chihuahua Mexico last year, I saw a lot of Ram 4000's drving around out there, alot were big box trucks or flatbeds and a few were Cummins powered. As far as propane power, that is common in a lot of pickup trucks of all kinds in Mexico. I bet a third of the pickups down there have a big propane tank in the bed, they run on propane when they are unloaded, it is cheaper than gasoline down there.