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I have my 2015 with a 4.5" Icon suspension and 5" rear block next to my new 17 stock.
Bed height on the 17 is 1" higher that the re-blocked 15, front end is about 3" lower.
I saw In person a 17 SD with the 3" coil over level kit and stock rear blocks and 35's and it was the same size (with in 1/2") of my lifted 15. Front and rear.
I am going with the King coil over 3" level kit, no blocks, sits 1/2 higher in the rear and looks great, with 35's.
I'm fixing to level mine out also and wondering the same thing myself.
Rutcutter, After having your 37" RTs on for a while now, what kind of mileage are you getting? I've run 35's for years and average 14 on my 2011 F250, which I'm okay with, but don't know if I want to do much worse than that.