On a 4WD WK2 or any AWD vehicle all tires should have the the same overall diameter. There are people out there that have destroyed center diffs even with just having bald tires up front and brand new tires in the back. The speed difference is just hard on those parts. Not to scare you away from a staggered set up or anything but if you decide to go through with this get the overall diameter of the tires to be as close as possible if not the same. Good luck man.
'11 Laredo / Bright Silver Metallic / V6 / QT1
40% windshield tint, 20% front sides, 255/70/17 GY Wrangler AT Adventures, 5000k LED interior and reverse lights, K&N drop in filter
Audio: Pioneer AVH-X1500, Alpine MRX-M55, Rockford P3-12"