They are not great for driving standards but it’s what you can expect. If I have to take a taxi which is very rare I would hail a taxi on meter. Why not drive yourself ?
You can own 48% if you are committed to the business learn the language and apply for citizenship then you can reapply for 50% it depends every person is different. It also depends what the business is
The land is included normally they will transfer a chanote certificate at the land registry and that is where the problem may occur. Someone or some entity be it a business will need to own the land on which you will have the lease. One option is the land is owned by a business if you have one of which you can hold 48%. It’s really quite hard to get complete ownership unless it’s a condo.
The people I know are volunteers they fund the truck themselves and get paid nothing. They are volunteers in every sense of the word. I will ask him if others get paid but he already has a decent business so money would not be of interest.
I would air on the side of caution and get the international licence you might get an officer who knows the law or his version of it. If staying it’s quite easy to get a thai licence