IMHO, you still need these for any high walled RV:
Larger trans cooler
7-pin wiring harness
Class 3/4 receiver
Proportional brake controller
Towing any high walled RV is hard work. Not only are you asking the engine/trans to move twice the weight it normally does, it also has to pull the parachute through the air at 60-65mph. You have a 4-spd trans, 3 usable towing gears. B6 axle code means 3.73 (limited slip), as good as if gets for the 2007 F-150. You can argue against the trans cooler, but that's the cheapest part under $100.