There is a winter storage guide on the IM site, and yes it suggest 3-4 lbs more air and a full tank and gaz line antifreeze or stabilizer, I use one of the new battery conditioners which is not a constant trickle charger and my batteries have lasted fairly well.
Our issue is the cars don't move much hence if you don't drive it for a long period in the summer and you have a lot of gadgets that suck power you can find yourself stranded. Hence I plug the conditioner even in the summer and I carry a Juice pack, from Allens, just in case.
