You should be way more than happy with the truck.....I don't worry too much about past towing use. Towing is what these trucks were built for and its pretty hard to abuse them unless you just really over load them and have a heavy foot. Drive it and check for responsiveness, shift consistency, steering, braking, and also check all of the fluid colors and smells. The dealer doesn't always think too check these things. I went with a buddy about a month ago to look at a used Duramax. He was checking fluids with the salesman standing their and when he pulled the dipstick on the Allison, the fluid was BLACK and BURNT!! That right there saved him from someone else's abuse and headaches. Anyway, hope this helps and whtever you do, don't buy a Powerjoke (ford). 
__________________ Byron
2005 liLLY 4x4..... ZF 6 Speed  , no muffler, lost kitty, Autometer C2 Pyro and Boost Gauges, EGR Blocker Plate, PCV Re-route, Resonator delete, By-Pass Dual Filtration, Amsoiled front to rear, Fumoto Valve, Texas Ranger CB.   proud to be an American!! 106,000 MILES and counting
1999 Park Avenue 36' 5ver
2002 Hart 6-Horse GN
2 Welsh Corgis and 1 Aussie Shepherd | 
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