A prior version of the manual (6th edition) specifies:
TIRE CHAINS (TRACTION DEVICES)
Use of traction devices require sufficient tire-to-body clearance. Follow these recommendations to guard against damage.
• Traction device must be of proper size for the tire, as recommended by the traction device manufacturer.
• Install on Rear Tires Only
• Due to limited clearance, Thule XG-12 Pro or equivalent is recommended on P245/70/R17, P265/60R18 or 265/50R20 tires.
The Thule XG-12 Pro
have a 12mm inside sidewall and treadface clearance.
The Super Z6
specified by the later edition manual has a 6.3mm inside sidewall clearance and a 31mm treadface clearance.
Older WK2 owner manuals said "Class S" or better is fine, which is 15mm inside sidewall clearance and 37mm treadface clearance.
I ended up getting some Peerless Auto-Trac #0232105 chains (ratchet auto-tightening). They meet "Class S". They're not as tight to the tire as the Super Z6, so I'm going to test fit in my driveway to make sure there aren't any clearance issues. If there are, I'm going to see if putting Quadra-Lift (air suspension) in Off-Road 1 is enough to clear.
I'm really hoping I don't have to use Super Z6. I hate cables. They just don't give the traction that a real chain does when the stuff is thick and nasty.
I'm in Washington State and the law around here is that when chains are required in the mountain passes, AWD/4WD vehicles with snow tires aren't required to put chains on, but are required to carry them.