How many times are you really going to move it? If only a couple a times during winter, it's not a bad idea to start it and let it properly warm up and circulate fluids. As Boxer says, better to just take it for a drive but I can understand that in Quebec that's not really an option as the winter is much harsher there.
Regarding flat spots I have never bothered - my 550 stood for 9 months last year and I didn't notice anything. I think it needs to stand for longer than that for it to become a problem.
I am with the others, Mario. Don't waste your time, money and energy with that. (I've been there before with my other cars, once upon a time).
Simply calm down and treat your beauty as a car and enjoy it. Knowing how harsh and long the winter there can be, there must be a more simple and inexpensive methods. w/ smiles Jimmy
I have never bothered either but a cheap way would be to make the tyre dollies yourself out of wood? I have checked with my dealer and they say a slight over pressure does no harm to the tyre structure. I keep an air compressor in every garage. I agree strongly about regularly starting the engine, pushing the brake pedal and turning the steering wheel.
The absoultely best way is to buy snow tyres and enjoy.
The bad news: Time flies
The good news: I'm the pilot
You cannot make life longer but you can make it wider and higher.