No pics yet but I just got my Carli lift put on my '14 a few days ago (BackCountry 2.0 with full leaf), and the truck is totally transformed for daily driving. Have not towed yet, but I don't anticipate any issues as my trailer is relatively light (6000lb).
I kept with 20" wheels and didn't change much on tire diameter, so I am confident the change is the suspension and not the added sidewall that a lot of Carli guys have. Would it be even smoother with more sidewall? You bet.
I have some vagueness present now in the steering: might be not enough caster? I am working on the issue to resolve, but otherwise very happy with the new set-up.
The Ford tech that installed the Carli kit (yes I had it done at Ford my truck is still on warranty - didnt want dealer to try to weasel out of warranty work later based on who did the work) commented that he was really surprised how well the truck rode for his test drive. He had been convinced that the ride would be much worse lifted.
As for the smaller vs larger Carli lift, I guess it boils down to personal preferences and how you plan to use the truck. I was originally looking at the smaller kit but changed my mind when I decided for the full leafs. Also I thought about the lift and on a F350 the 4.5 is not that huge of a difference height-wise as stock is pretty high to begin with.
If I did it again, I would spend a bit more and get the Pintop with Kings (stainless shaft upgrade) as they are rebuildable.
Good luck with your decision.