Well I am in Colorado where it is fairly dry. We don't wrap the wing in
plastic, just drape in across the top and secure it with gromets and
string or those clamps. No one is getting condensation. If you are
worried about condesation, put some wood blocks on top of the wing to
get some air circulation. Also, Aircraft Spruce sells spark plug hole
fitting gadgets that have dessicate in them. Keeps your cylinders dry
if you don't want to pickle, though pickling is best option for the
engine. Plug all the holes with cut foam or some such to prevent
critters from getting in. If you have a tailwheel you can put a metal
can around it so nothing crawls up and into the fuselage. The planes
that don't have plastic on them and sit for a long time get bird
droppings and a lot of dust collecting on the top. Best to protect it.
Wash it and wax it before you store it. When you undo it to fly again
you will appreciate all the work you did to preserve it. Hangars cost
upwards of 5k a year, so it is questionable whether it is cost
effective. Contact your insurance agent and see if they have storage
only insurance, you might save some there.