Congrats on the impending nuptials.
Bangkok Airways baggage policy is not that generous:
Checked Baggage
Economy Class : Maximum weight allowance is 20 kilograms for adult and child / 10 kilograms for infant.
Blue Ribbon Class (Business Class) : Maximum weight allowance is 30 kilograms for adult and child / 10 kilograms for infant.
Excess Baggage Rate Charge :
Domestic : THB 80 per kilograms, per sector will be applied (effective from 1 March 2013 onwards).
TG is a bit better:
Royal Silk Class 40 kg (88 pounds)
Premium Economy Class 30 kg (66 pounds)
Economy Class 30 kg (66 pounds)
We will be coming into BKK via DL and spending the night, flying out the next day from either BKK or DMK, which ever makes the most sense. We are getting married in Thailand as well so we'll have what I assume to be plenty of luggage, so that is something to consider I hadn't previously (used to DM Status on DL).