One tenured job to another tenured one? I have recently been promoted to associate professor with tenure. But I want to relocate to another institution of similar rating. Is it possible to get an offer with tenure from another institution in the US? How common/uncommon is it in the US? Advices on the procedure with respect to the US academia will be highly appreciated.
The central part of my question is about the possibility for retaining the 'tenured' status at the mid-career move (e.g., how common it is and how to negotiate).
It is possible.  It is done all the time.  But you should not expect getting any tenured or tenure-track job to be easy.  Advice:  Don't resign your current job until you get the new one.
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My experience:
Perhaps the usual would be hiring an associate professor with a one-year probationary period, after which tenure would be determined.  Our university was reluctant to grant tenure immediately, so if we wanted it our chairman would have to make a special plea to the dean or even the provost.  On the other hand, I never saw the tenure denied after the one-year period.