OP, are you 50 years +.
If yes obtain a non O retirement and subsequent annual extensions.
Being from USA you could enter visa exempt and obtain the non O and extension using funds in the bank method.
You would also require a Thai bank account in your name only to start the process.
You state:...
"Marriage Visa ? while I stay in Thailand and she goes back to U.S.A. Regards Kenny Dee.
What you are calling a marriage visa is a Non O visa.
It can be based on marriage or retirement and the basis for extension can change from one to the other at time of extensions.