I use Sta-Bil as well, tire cradles optional:-)

You really have never flat spotted your tires (from sitting)? I used to use boards and still do on the coach, but with 2K+ worth of tires on the c2 i thought i'd give them a try and I was pleased. Live and Learn

 

Nope, never had a problem. The only time I experienced flat spots was on a dealer car that was on the showroom floor for who knows how many months. I took it out for a test drive and it had a funny vibration to it for a short time, then smoothed out. Dealer said they were flat spots from the car sitting for so long. With my cars I've gone probably a month or 6 weeks without driving, charging, or starting one of my Porsches and had no issue. But for 5 months of winter, I like to start them up, pull them out of the garage, move them back in and leave them in a slightly different spot.

 

I happen to store the pcar in the Summer rather than the winter and do what the manual says: tires at 58-60, stabil in a relatively full tank, battery tender, cover, (and lock the car). Also cap off the exhaust tips and leave a package of de-con under the car. Car is not moved or started for 4-5 months; last month (Oct.) it started on the 2nd crank which is better than with daily driving and the tires had lost about 8# each in pressure.

 

Tire cradles obviate the need to roll the car, but they are expensive (about $225 for four).