Which truck should i keep
 

I have a 2002 3500 dually Cummins extended cab, 4x4, with 57,000 and a 2003 2500 cummins 4 door long bed, 4x4, with 54,000. I have to sell one and i cant decide, the 03 rides better, has more room, but the second gen is just hard to let go cause its classic and i like the sound better. Mpg is about sixes between the two. Which one would you keep? I want the more reliable/longevity. Cheaper with less problems and so on. Truck is only used to pull my 9000 pound bumper pull camp trailer.