Am presently pulling a 8,000 lb Citation Fifth wheel with a Dodge Ram 5.2 engine...got about 9 mpg last summer, get about 17 without the trailer. Am looking at a demo 2003 6 speed 2500 RAM with Cummings for about $36,000 canadian or a used 2003 1500 RAM automatic 5.7 Hemi for $29,000 canadian with 20,000 kms on it. Am looking for any kind of advice or feedback. I may put 12,000 kms annually on the truck, it's used to go back and forth to work, approx 2 miles, some casual driving, and then family travel. For most outings we have a Jetta TDI wagon. What advantages/disadvantages re the cummings vs hemi. Service, wear and tear on both. Basically anything you can think of. Thanks...Peter ps. Just started 5th wheeling last summer and went on a 4,000 km trip. My preference would be similar, a 3 week trip at roughly the same distance with a couple more short hops throughout the summer.