By the way, I highly recommend premium economy class on TG.
It was the "best" flight ever to Thailand (LAX - BKK) and I
have been many times on many airlines. I think it is better than
United's business class! I thought the feedback may help for
other customers. And you are right about the luggage, if you go
with United to LA, only 50 pounds are given as an allowance per bag.