OK, so i'm taking my new (32k miles) 2500HD on a 1800 mile round trip to Fort Jackson in Columbia, south Carolina for a few days to see my friend before he gets shipped to Iraq. his pregnant girlfriend (long story) is going with me and splitting the cost of everything, so we decided that we could make the 15 hour drive without having to find someplace to stay during the drive. is there anything i should be concerned about on these trucks for a drive of this length? i'm hoping for an average of 14MPG which is what i normally get on the highway. a few days before i go (2 weeks from tomorrow) i'll have it serviced by the dealer and have them check everything over, which is part of the goodwrench oil change anyway. I know enough to take a couple quarts of all the trucks fluid's with me, but can the vehicle take a 15 hour drive(no trailer, and no load) without stopping for more than 20 or so mins every couple hours without burning up? it'll be about 1050 miles down and about 800 miles back, i'm leaving from Hampton beach and returning home to lenox.