I'm looking at an 05 cummins dually 6 spd Laramie pkg, alloy wheels, good tires, looks and drives like new, has camper tie downs, gooseneck and 5th wheel hitches, upgraded turbo and 5" exhaust. One owner and local dealer has done all repairs. I know front and rear ends have been rebuilt, 5k oil changes etc. Downside is 450k miles, price 11k. any advice?