Be careful of bringing your kit into Thailand. I know of two people that got turned over by customs for import duty when they did. Always take it through in your luggage never unaccompanied.
I have brought close to 200lbs (2 checked and 1 carryone bag) of dive gear to thailand over the last 5 years averaging 2-3 trips per year and never been pulled for inspection. My stays have been a combination of 30 day on arrival and 60 day tourist visas. Maybe there was another reason they were nabbed for inspection.
John