Probably not a bad idea, however, I think it's tied to the account.Looking at this thread, I am thinking it may be a good idea to add your spouse to the car registration. Would Tesla consider that as an original owner change? If I pass away, would my spouse continue to have free supercharging? Any idea?
So far I have transferred title/registration under my name but the vehicle is still under my FIL's account (I am just added as a driver for the mobile app) but I have the physical keys. I have taken it into service twice so far to get some things fixed and the car still supercharges for free.
I'll post any updates as time goes on if they kick me out of free supercharging lol.