Just returned recently from a 4800 mile trip to Texas and places in between. My 04 LLY handled our 28 foot 11,000gvw camper real nice... plenty of power...mileage for the trip was 9.75mpg.... I don't drive slow...65-75 depending on the posted speed limits...ride, driveability, dependability, and performance beat the 01 cummins I dumped to get this one... so far so good...no mods other than a flowmaster muffler... yet...http://www.dieselplace.com/forum/smileys/smiley1.gif