You are not showing a pattern of trying to live here long term on tourist entries, so you will be fine, no problems.

They have no interest in that at all, as it has zero relation to the DTV. It would not be in your favor to include it.

Anonymous participant 459 How can he train in Chaing Mai while living in Bangkok? From my understanding remote training has not been accepted, as if he is training remotely he can do that from anywhere in the world, and doesn't have to be living in Thailand to do it. You seriously think you can actually live 700km away from where you supposedly train regularly? Like I say, they are not stupid

They are not stupid. Ask yourself how you can regularly go to a Muay Thai gym in Chaing Mai, 700km away from Bangkok, where you say you live? You apply at Thai embassies for the DTV, and you are assuming they don't know the geography/map of their own country.

From my experience the only sponsorship letters that are allowed are those of dependants applying based on the husband/wife's primary application, not from those not married to the applicant, and dependants based on that marriage. Your mom can't write a sponsorship letter for you. That hasn't been approved anywhere.

As long as he uses it with in five years he is fine. He got the DTV. Nothing will change for five years for him.

Currently no, they are not checking anything when you re-enter the country.

You will also need a letter from your business stating that you are allowed to work remotely, even though it is your business.

It is five years from the date of issue. If you don't use it by then it becomes invalid.

You will have no problems exiting Thailand, and returning immediately with the DTV.