8131, DWs and Spiderman (note my *belief* means I do not have hard Expy facts--only well-intended assumptions):
1. I am raising my truck 1.5 inches all-around at this time. I am operating under the *belief* that when you lift our particular rigs via shocks or suspension spacers, it causes the wheels to move inboard very slightly (tucking in away from the fender edge) as the A arm descends in its natural suspension arc. I *believe* this due to the design of independent suspensions, and have observed this when the truck is on the lift, as the unloaded suspension descends. I *do not know* if a mild lift of 1.5 inches causes this tuck in, or may even bow it out a bit. But we all have observed that the rear lift pulls the tire forwards towards the rear door, so there is a geometry change going on...
2. I am operating unber the *belief* that when you add slightly taller and/or wider tires, there is a slight benefit from a very mild push from the thinnest of spacers towards the fender edge (I do not want my tire edge to go past my fender lip--this is known as "tire poke").
3. I am operating off the *belief* that slightly factory taller (raised) vehicles with a new higher center of gravity will benefit on-road/off-road from widened tracks.
As a result, I want to add (hubcentric) 5mm spacers upfront and a 10mm spacer out back (the rear track is tucked in 5mm more each side than the front, so I wanted it even). The 5mm will work fine with my factory lugs, but I feel the rears with 10mm ones might benefit from a slightly extended lug to ensure a solid bite from the lugnuts (enough turns on the threads).
HOWEVER, when FORD made its considerations to the vehicle and the handling properties, I do not know if the differing tracks was intentional to give the truck better/safer handling. It could of been a cost saving measure or consideration from changing the front suspension geometry in 2018.
And as far as maintainance and looks I do not think I will have much to worry about, considering how many people here and with F150s raise there suspensions fully by 3/2 inches, add wider wheels well past their fenders, and report no additional problems. That being said, I am willing to accept the additional cost if incurred it in the next 100K + miles.