Going to look at a 2016 F450 Platinum on Saturday. They are asking $56000. Has 43000 miles and dealer has had it for close to a year. Clean Carfax. Not a huge Ford fan, my 6.0 cost me a small ...
OP...not sure what weight your pulling, but if you can find a 2015/2016 F350 drw with 4:30 gears and the high capacity tow like mine it is rated for 26k towing. Yes I believe the 450 will tow 30k but the gvwr is the same between the 2 truck.
BTW brand new last year I paid $60k and got 0% financing this is why I feel the F450 you were looking at is too much.