Will be getting my spare rims shod with the winter tyres I just picked up, at the end of this week, and will be swapping them onto the car in a couple weeks/end of the month, so my decent allows with summer tyres will be stored over winter, till spring.

I've not got a garage or a large enough shed to have the wheels standing upright the whole time, so I'm going to need to stack them - whats the best way to do this? Simply separate them with a bin liner (so as not to get rubber to rubber contact, and also protect the alloy face), or with cardboard (is this wise since it harbours moisture?) Do I need to rotate them in the stack (ie, after a month, move the two bottom alloys to the tom, etc)? Ideally I'd like to store them at full pressure, just so it's easier when it comes to swapping them back onto the car it's driveable (I realise they'll probably need topping up with air, but they should be full enough to drive a mile to the petrol station to do this, right?)

Never stored wheels and tyres off a car before, so just wondering what's good advice. From what I've read it's ok to store a max of 4 wheels/tyres in a stack, but they should be rotated regularly, and ideally bagged separately. But thought I'd ask anyway