Should I get a new Tow Vehicle or a Bigger Gas Tank?

If you don’t want the turbo in the Ford, with the 5.0 you can get the 36 gallon tank as a separate option or as part of the Heavy Duty Payload Package (HDPP) which also gives you well over 2000# Load Capacity with a heavy duty axle with 3.73 gears and and extra spring leaf, with towing package. Adding a Factory trailer brake controller before or after purchase (parts just over $100) essentially gives you the Max Tow package without the 3.5EB & mildly upgraded hitch receiver. And Max Tow comes with 3.55.