It is very expensive to move a containerload of furniture to the DR. This poster had the experience over 20 years ago. It is advisable to reduce the load. Keep what you really need or have emotional attachment, sell the rest. use the money to purchase needs in the DR. Get rid of 220v electric appliances as the DR is 110-120v. Servicing and repair of the 220v appliances in the DR is a risky gamble, ...lack of parts. Overstuffed furniture such as sofas and chairs are not advisable in the very humid tropics. List, number, and label what goes into container, take pictures. Seal container with a numbered seal lock. Do not ship liquors, they risk being stolen during customs inspection., every article is removed from container at the inspection. Witness seal being broken. The vehicle will be removed from the container, sent to the impound area. Take pictures of it when it comes off container and in compound area. It can be retrieved when taxes (if any) are paid along with insurance, registration, and license plates are presented at Customs. Do the documentation quickly, storage charges will begin to accrue after a time. Know when container will be opened and inspected, bring people (eyes) to witness goings on and bring your packing list. Note: If your wife is Dominicana as you mention, use her name and your name on the shipping and export documents.
Good luck and Regards,