Couple of additional things to consider.
Downsizing from 20's to 17's or 18's fitted with AT tyres, tyre plug kit, good tyre pressure gauge, tyre deflator. Would also ditch the OEM tyre "brace" and carry a 600 or 800mm breaker bar with appropriate sized deep socket to deal with any stubborn lug nuts.
Portable high capacity air compressor.
Decent Lithium jump starter.
Seeing you have air suspension a spare Pressure Retention Valve.
Spare fuel filter, consider fitting an additional fuel filter/water separator as discussed here....
After reading some of the horror stories in CT regarding catastrophic engine failures caused by dirty fuel, I have decided to fit a Stanadyne Fuel Manager (FM100) system to my 2012 T3 V6 TDI. I have searched this forum as well as myTreg (UK), but cannot find anyone who has already installed a...
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Spare belts (serpentine and toothed) including tensioner.
You most probably will need to add engine oil during your trip so carry sufficient spare oil and coolant. Don't forget also to have a spare sump plug, just in case.
Don't forget to have various size pieces of luber

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Tony B