Kool Breeze, thank you for the advice. I looked and did find that multiple entry tourist visa. looks like a good option for me. I'll be doing that while I am in the US for the summer.
You apply for an e-visa from embassy in your home country at thaievisa.go.th and do it quickly because the process takes longer than you expect. Your travel agent cannot help you with this part of the process.
I have to say I am not familiar with a tourist visa for USA citizens that is 6 month multi-entry. I think you are referring to a tourist visa that you have up to 6 months from date of issue to arrive in Thailand. I just got a tourist e-visa while in South Korea last month and it was a choice of only 60 days and only single entry and I had up to 90 days from date of issue to arrive in Thailand. That was my experience.
My wife is a USA and Thailand visa expert. If you actually need help you can contact us on messenger. She is a Thai national, she did all the work on the marriage visa (no visa company, no lawyer and no help from me). She has dual citizenship and more intelligent than most people. I also read posts here and research on YouTube and sometimes phone the embassy or personally visit the embassy. My most recent visit to the US embassy, the person who made the document did it wrong and I spotted it at the counter. That ruffled the staff person’s feathers and after a huff and a puff, it was redone correctly. My own embassy.
Wait a minute! What country is the money coming from? If it is the USA, I have transferred many times, and many amounts to Thailand. Every time I transferred $10k or a bit more, it was the same as shining the (gotta research this person) spotlight on my wife and I. It was the bank, they reported it to the government. Then, you are suspected of money laundering. You don’t want that. Stay under $10k per day. Recommend transfer $9k or less for as often as possible and there will be no extra scrutiny on you. Just sayin’.