Registration on on a F450 may be huge. I pull a 13,000# with a F250 with 3.31 gears without any issues. Been coast to coast and over the mountains and truck didn't miss a beat.
If you need a dully than get one. You can get the 11,400# load package in a F350 SRW
Wow it wasn't cheap ether. $74,000
Lariat trim 3.55 gears no moon roof but with most of the bells and whistles. The diesel motor went up $1,000 sheesh Guess I will keep my 15
My truck is a 4x4 and it has a shorter turning radius than I thought it would.