xfirelvr,
I have been putting my Crossfire into winter storage for past three years and I have been using 1" thick rubber mats under the tires that I bought at Hoe Depot and I have not had any issues with flat spots. Last year I started unloading the suspension while it was in storage to keep it from sagging here is the
Link to jacks I used. The only thing I am going to do different this year is start the car once a month and allow it to come up to temperature before shutting it off. Last Spring when I started the car off I had a lot of lifter noise which I never had other years when I would start it occasionally before I started using the battery minder. I am guessing that sitting for so long (5 months) without being started allowed all the of the oil to run off the valve train and it was probably a little dry. I am sure it didn't do it any good, but positive note the lifter noise as never returned.