The ONLY likely check they might make at some borders upon re-entry is when someone is coming back after a quick 1 hour border run, having spent all their 180 days in Thailand with no time spent outside, at such borders as Ranong.
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Baht in cash may be requested in such cases, but certainly not your bank account details for instance. No one is going to be carrying around such documents to show in a long line of tourists, holding them up at a land border.
Otherwise, as you state, when you do an extension, then yes, they may ask for similar documents to the ones used to get the visa.
I'm wondering whether immigration will make up their own rules, such as needing to have 500,000 parked in a Thai bank account or for a minimum of 3 months in a foreign bank account and then using their own poor exchange rate try to deny your extension because according to them, your balance is only 498,560 Baht, whereas according to your exchange rate it's 501,450 Baht or something like that.
Highly unusual and an almost impossible task in some jurisdictions (for example, in Australia...if you're in Perth they can't ask you to fly to Canberra...it's too far away).
Anonymous participant In this case, perhaps they need more info? Still, I can't understand why such things can't be handled via email, over the phone or just by asking you to submit the relevant documents via their system.
What does that have to do with anything? I don't think the Thai consulate is interested in an applicant's race. Nowadays, in countries such as Malaysia, everything is dealt with online.
How did you manage to open an account on a DTV? Nearly everyone is saying it's difficult.
Not that I need to, I already have 2 Thai bank accounts and I don't need any more. Just wondering why your experience is supposedly the opposite of everyone else's.
No, they just look at your arms, legs etc. It's a very quick process.
I recommend going to a pop up clinic next to a DLT. You may very well be the only person there, so there's little to no waiting. They basically do nothing else but issue such certificates. Probably 50-100 Baht.