You can only have one primary residence for tax purposes. It will all be based not only on the facts as you present them but moreso your intent in doing so. Just registering your car and having bills in Fl will not persuade your losing state that your "intent" was to make florida your permanent residence and you are not doing what you are doing simply to avoid state taxes.
I have know people that title one home in Fl to the husband (most pension income), while the northern home is retitled in the spouses name. Where will you file your federal taxes from? HOw many days a year do you plan to be living where...and can you substantiate it. Again it will not be Florida asking these questions but your losing state.
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