What ever you prefer, I know when I arrive i always have a paper copy of my visa and hand it over with my passport to keep it simple

As long as you contually meet the criteria for an extension then presently there is no limit

Did you use the official site ?

You sound like you are very much a tourist with minimal stays and with lots of time away from thailand. You should have no issue getting a 60 day visa exempt for your next trip. The TDAC is not connected at all to the visa process, it is thailands electronic version of the paper based entry card they used many years ago. So filling one in is just telling/ confirming you are arriving and where you are planning to stay ( at least for the first day or so) nothing more. A TDAC does not give you permission to enter

Not sure what country you are from but if you got stamped in for 60 days then you will have been stamped in visa exempt not VOA. You have no visa at all. Can you extend this visa yes you can by another 30days. You will need to do to your local immigration office to check what they need to see for the extension. You dont need to wait until your visa exempt runs out you can go typically up to 3 - 4 weeks earlier but again you need to check with your local immigration office, the extension will be added to the end date of your current exemption stamp

Nicholas Curd arh ok then your best option is to get a non o over 50, 90 day retirement visa in your home country before you leave for thailand you can use the funds in your own country bank account in your own currency. This enables you to open a thai bank account as soon as you enter to deposit the 800kbaht funds for your extension of stay. You can't get a bank account without arriving with a non o and you wont get your extension without the thai bank account

I would first look at the costs of living in thailand before you think its cheaper especially with a family, you say you dont have money for a DTV how will you afford health care for your family as its not free in thailand like the uk, travel insurance wont cover you for that long so you will need something? I understand your concerns in the uk but you need to do some homework before you look elsewhere

What are you planning in thailand? Retirement a holiday ?

ArticulatePassionfruit2981 the e visa application if you get your documents ready on your laptop should be straight forward. If you struggle just drop me a line