What's the max height of garage at work? Most of them in my town are set a 7' which barely clear stock height yukons! There are a few with 8-9' that I can get in with no issues. I will check the roof rack height tonight and tell you.
The FTS kit is really a good kit and is big for 7", measures more like 8". Only downside to lift is mine was so tall I had to get their UCAs so they wouldn't hit the droop stops over big bumps in the road and the rear trailing arms were super close to axle stops. So I ordered Fabtech upper and lower trailing arms with bushing kit from summit racing to gain better clearance out back. That combo makes the kit perfect!!! Now that mine is at 7" I want to take it up to 8-9". I almost bought the CST kit but said you will always want bigger so went with FTS. Yes there is cutting with any lift on the rear passenger cross member bolt holes. Nothing else was cut and even 4" kit can require more cutting. It's an easy weld repair if I ever wanted to strip the lift and go back to stock height.