Remember that from 1st Jan you won't be able to charge in the car (unless you have the mother of all LiPo sacks of course). I always take them out to charge anyway for 2 reasons;
1) makes it easier to work on the car if it's not plugged in to the charger
2) if anything did go wrong I would only loose the LiPo not ALL the equipment!
From the point of view of keeping the LiPos healthy you should let them stand and cool before recharging anyway.
Two packs is enough, just make sure they are identical as weights varry wildly!
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