Anybody towing 36', 9000lb TT with F150 HD payload ecoboost

I think you have all convinced me. The 250 seems safer all around. Now gas vs diesel I think the diesel is not worth the extra cost for the weight I am towing. I don't expect to go bigger anytime soon. Also based on fuel cost, maint cost and mpg, the diesel only saves me about $300 per year so i would have to use it for 26 years to recoup the $8000 premium. And that is with todays prices in Austin.

Gas Diesel
Cost/gal $2.50 $2.75
MPG City 13 16
Towing 9 12
Hwy 16 20
Maintenace $0.00955 $0.0276

Any thoughts?