I've lived in Pai for 20 years. Let me know if you're coming to Pai. Don't bring anything that is not work on 220 Thai juice. Should be able to have two check-in bags and you can buy an extra one or two if you want. I would not ship anything and anything that is valuable that is being brought into Thailand to stay they could charge you 25% import. Tax. You might want to come in as a tourist and just get a visa on Entry and then they probably won't try to charge you tax on anything because you're just a tourist and you will be leaving in a month or so. You could call Star Visa in Chiang Mai they are very good may be able to give you Vice. Probably best to call Thai consulate or Embassy for information next. If you have expired Visa you should be able to get it renewed from consulate or Embassy in US