I would stick with something in the '05 or '06 range. We're talking 13 years old with an '06. Low mileage is going to be a "unicorn". The 3.0 is an engine that is practically "bullet proof" if it has had even a modicum of maintenance. So, maintenance records are going to be key as is the need to DIY. If you will be having a mechanic work on it, forget it. When all is said and done you'll spend far too much money on your truck if you pay a mechanic for the work. I have over 230,000 miles on my '06 and if I didn't do almost all of my own wrenching, forget it, I couldn't afford it and it wouldn't be worth it. Look at the Blue Book on these vehicles. They are DIY vehicles.