Would you do this?

I have a 04 durango 5.7 with 60,000 and warranty untill 85,000. Am thinking of trading in it on a 03 2500 diesel with 160,000 miles. Truck just had new reman trans put in,has edge chip,magnaflow exhaust and k+n intake set up. Was owned by a older person and he used it to tow his camper between wisconsin and florida. Biggest reason for this is durango gets around 16 the truck gets low 20's and then I should be able to haul about anything needed. I would have to boot some money also but truck is fairly clean. Any thoughts?