U can bring the lot... As for truck u can Only bring in on temporary importation(meaning it must go back, and u have to provide proof of paid return of car) permit.. Remember u will pay deposit to customs.. So if car is not out by agreed date.. U loose deposit.. If u really hell bend bend on keeping truck in thai.. Its possible (with right garage) but it will cost price of 2+ new trucks to give your American baby thai plates.. So get rid of it and buy in thai.. Unless it's so sentimental to u that u prepared to pay 2 and half new truck price to slap thai plate on old.. Its all about money..then all possible.... And it's right hand drive.. Even more cost to convert.. Because no connection will be able to class a truck as a classic/collectors item... They in different bracket... Not for use on public roads same as motorsport importation..