I have an '07 FX4 with a 2.5" leveling kit and im wounding if anyone else has the same and does alot of towing. My camper is 4000lbs and it pulls ok im thinkin about maybe air bags and some engine mods. ( yes i used a wieght dist. hitch )

 

ive got the 3" kit and shackle in the back, the most ive towed so far is 6500lbs and the truck pulled it fine without any problems excellerating or stoping, very pleased.

but ive got a programmer and exhaust