i have heard the sport chassis's are nice..my brother is looking at MDT's to haul his 42ft cougar toy hauler as i give him grief his 1ton cc drw is not big enough..being as i don't beleive there is any "overkill" when it comes to tow vehicles..heck i got a f550 to haul my slide in..looking at air ride seats and converting to full air suspension of my design..so pick the one that strikes your fancy and enjoy..
as to 1tons weighing 6,000lbs my ford left factory at 6,700 and change, but it has a double frame :B