You'll have to cut the bumper at an angle and do the norcal big fender mod. My last setup was 20x10 -19 and I rubbed on my mudflaps with the bolts all the way out. I ran a 305/50. I also raise the front bumper up about 3/4" to get ride of the gap.
Curious about the arb as well. My truck isn't a DD, and it only pounds the pavement, starting to go to the track more often as well. Was even think about a grizzly locker.