In Israel Thai's are brought in specifically to pick fruit in hothouses, a hard and not well paying job (by Israeli standards).
Socal seems to have quite a number of Thais around. There is even a little Thai neighborhood in LA just to the NW of Silverlake.
Yeah there are some of course, but very few as a percentage of Thai population, compared to the number of migrants from other Asian countries. Of course to be fair this is partly just a simple matter of economics - Thais are
much better off in rough per-capita-gdp than say Philippinos, Indians, etc, but it also has a lot to do with various quality of life issues such as societal functionality and good governance.