You will want to cradle the tires to avoid flat spots. You can buy specially built cradles for this, but a cheap workaround is foam board. I bought a 4 x 8 piece when I stored my car for 4+ months, cut it into 8 - two foot chunks and put two each under each tire. When I returned, I just drove off of them. No flat spots whatsoever.
And yes, you need to trickle charge the battery, unless you intend to install a new one when you get back.
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