I keep two US bank accounts, each with a credit card. One bank is a credit union that doesn’t do international wire transfers but you can get money quickly through the credit card. (I only do this in an emergency). To keep them active login to the account periodically and make charges to each card periodically. Keep a US address with a family member or trusted friend. Get a new card just before you come here. I have renewed cards sent to my sister’s US address and she sends the card to me.
You should get an O visa in the US. Be careful not to get the OA visa unless you have researched the features of the OA. If you qualify for an LTR then that would be my recommendation.
I have never made a claim. I have a 40,000฿ deductible. I’ve never had a medical bill over 20,000฿. I am getting a 20% no-claims discount. Their customer service has been excellent.
My observations on this subject is that every company has customers with good experiences and others with bad experiences.
Those of us with a pensioner LTR visa pay no taxes in Thailand on money brought into Thailand. After that US citizens are supposed to pay federal taxes in the US. We don’t pay state taxes in the US if we are no longer a tax resident on any state.
When I had a Kasikorn account, all my wire transfers from the US were coded as domestic transfers because the money arrived to Kasikorn through an intermediary Thai bank.