I just finished my build. It's a 2011 4dr Rubicon. 4" lift & 35"s. wheel spacers, stock wheels.It drives like it did stock.
After the tires were installed I had it up to 80. No shakes, No DW, No vibes.
The thing is I forgot about the over size tires and the speedo being off. Plugged in the GPS and I was doing 85 not 80.
On back spaceing you should go with a 4.5" or 4" so you would not need spacers.