Just have your mail sent to your family member address or a friend, and that will be your new address. They don't have to know you're out of the country. Come home once a year to your primary doctor for your blood work and physical. Keep that money going to a bank in your country / city and you can withdraw it while you're in Thailand. It's a need to know basis and they don't need to know You're living abroad. Keep your health insurance from SSDI. That's my own personal opinion.
I know you really don't need one, but I would strongly suggest getting one. It's done professionally and would seem more legit if it ever had to go through the court system.