I have a 2011 F350 with the plow prep package so it has the heavier duty springs in the front which is supposed to make it close to level, but still isn't. I plow with it and also tow a 26 foot enclosed car hauler with cars. Would a leveling kit be okay with these? Or would the truck squat a lot? If not, what would you reccomend for a leveling kit that would be okay with plowing? Thanks for all your help.