Hey Switchman,
I came from an 06 E53, 4.4i and now have the 08 3.0. It came with the Bridgestone RFT and they were pretty loud, tread was off and had bad balding, whatever the heck.
Switched to non RFT Pirelli's and love the tires but yes spare tire was always a concern. I have 3rd row seating so spare tire wont fit. I bought a large can of slime and portable air compressor and cross my fingers. Many here would argue religiously against this but hey its personal preference. After all its your X, your tire and your payments or ownership
. I used to drive a 300c SRT8 and had 20 performance non RFT and no spare. The vehicle came with slime and compressor only. I did get a nail and put in slime and air and till i got to a shop, the nail was removed and my tire fixed for 15 bux.
Most E70 will come with RFT since they are standard I believe. But if you don't get 3rd row, then you can get the spare kit. Will probably cost you $300+. But if you want to be economical, pack of slime and air compressor won't let you down either. Good Luck!