Also, I was pulling a 28ft enclosed with my car inside and getting 14mpg towing at around 75mph. The trailer was weighing in at 10k lbs packed to the gills, I went:
columbus to long beach, ca and back
columbus to atlanta, ga and back
columbus to wall, nj and back
columbus to seattle, wa and back
columbus to cleveland and back
columbus to vegas to LA to sonoma,ca back to LA then to irwindale,ca and then to the SEMA show in vegas and back to columbus
columbus to reading, PA where its stored for the winter.
that was my summer in my Dodge. Not one mechanical issue, even with all the miles on the truck.
also, read up on Hot Shoot truckers. My truck pulled all over the country like it was its job....it actually was its job. I got the truck with a 110gal aux tank, 5th wheel, 5in exhaust, bully dog, and some other trick stuff, all for $16k for a 2006.
http://farm6.static.flickr.com/5125/5281495299_554edfc3e9_b.jpg