I want to do a 2.5'' level on my truck and probably go with bigger tires when I need new ones(soon 10k-15k miles). Will this cause any rear sagging when I tow a trailer? Thanks

 

I'd go with a 2 inch kit on your '07. The 04 and 05 F-150's needed a 2 1/2 inch kit to level them because they sat taller in the rear. I'd level the truck then see how it look's with whatever trailer you'll be towing and go from there. You can alway's add a taller block, helper spring's or airbag's if you tow something heavy.

 

Yes it will...depends on how much weight on how much sag...when your truck sits level and you hook up weight to the rear it's going down.