When my wife's '13 was off the road and the indy eventually got his insurance involved we were told to get a rental. Local (Bolivar, MO) took 4 days to produce a RWD Nissan to fill the request for an AWD X5 equivalent. Reliable are reasonable to deal with and sound like they are taking care of you. It is not a big job despite what you may have been told. For a factory tech it should be done in an hour or so as my indy can do it in not much more.
Expansion tank take 15 minutes I have been told but am willing to be corrected.
GL.

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i