With the rear wheel wells only being 34" I doubt you'll be fitting any 35's in there. You might with the 5" lift and a 3" body kift. Or taking the sawzall to the fenders.

The Calmini truck from what I hear is only running 33's. I would think that if larger would fit that they would do it.

The only thing that stops me from going to the 5" lift (Calmini or SLR) is price. It's not going to be cheap. If you got the money then go 5", if not, go for the 2.5".