The tires are a 295/79r18 COOPER STT PRO. Front fender measurement: 41-1/2", Rear fender 42". The ride is great, angles are flat. 1.5" bora wheel spacers were ordered the week before last, I hope they are getting close.
The lift actually measures around 5" from LCA bolt to New LCA bolt. Like mentioned above, you could very easily run a strut spacer up front.
My understanding is the 4" and 6" are very similar with some of the same components but the 6" has longer struts up front, replacement coils out back with a few additional components to address suspension linkage in the rear.
Over the years I have had several lifted half tons lifted 6"+, regeared, running 37's, with my last truck being a 2500HD LML duramax running a rancho 4" on 37"s. So for the first time in my life I was attempting to run a smaller lift but still functional with a good ride and I am 100% satisfied with the BDS so far.