Then tell it like it is, it can't be a problem.and report it to Immi through your girlfriend when you get there. Private individuals also have to do the TM30.
Idea in which country you are applying for your TR60. But with the online visa you will be asked why you are traveling to Thailand (visiting friends/family). and you have to upload your friend's invitation letter (with address and ID card).So there is no reason to be asked when entering the country because everything is already known. But don't forget to report to immigration within 24 hours of entry (TM30).
I live there 6 months a year. My partner has her own house car...everything is there. But in total everything costs a lot of money. And the sums you're talking about are the depot alone For the visa if you want to call it that. So no amount that is not available and must be there.
I don't need that because I currently travel three times a year with the TR60. But since this statement comes directly from the bank, it should be accepted. This is what the next page looks like if you continue in the app. I might order it sometime to look at it.