Need tow vehicle - preferably under 10k

Also, is there any range/restriction on mileage or how old the vehicle model should be if we get a 3/4 or 1 ton pick up? In my price range, we are looking at vehicles between 2002-2008 with mileage of 170k+.

Also, this is a bit vague, but would any 2500 pull it? I would definitely look at the numbers and axle etc, but, in general, would they tow better than our expedition?