SANTO DOMINGO.- The Dominican Customs Agency (DGA) will penalize locals or foreigners who import vehicles on the Santo Domingo-Mayagüez Ferry under the temporary category, and haven’t requested a justified extension.
People in that situation and who haven’t submitted proof the vehicle returned abroad have 15 days to go to Customs Office in the Ferry Terminal.
According to Customs Law vehicles can be brought to the country on a temporary basis for 30 days, and at the end of that period the owner must request an extension.

I was told that my deductable was $1,000.00US a bit high but that is where they cover themself for antthing thin within the 1-1000 range.