True. 3 - 4 months isn't very long...the things you mentioned are worth doing if you are going off for 3 - 4 years.

The cold environment might even preserve things a bit...

...which does bring up a point...if you do return to the car a few months later to resurrect everything, pick a warm day!

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car