If there are more than 2 of you, then you may want to rent on STT. Grocery shop before heading to the car barge. It also depends on your arrival and departure times on STT. Whether they coincide with the ferry schedule. www.vinow.com
Hertz doesn't allow their cars on the barge. Either way, reserve well in advance.
Many people rent on St. Thomas but we prefer renting on St. John. We've experienced mechanical trouble withour jeep a few years ago and it was difficult enough getting a differnt jeep on St. John. Can't imagine what it would be like having to deal with getting a replacement from St Thomas. Plus while we don't mind driving on st John, the extra traffic on St Thomas is another reason we don't rent there.
When we are staying for a long time or have a large group to feed we usually rent our car on St Thomas (through Dependable Car Rental), shop at Cost-U-Less (which is like a stateside Costco, but not with the vast variety or freshness). Check with your car rental agency to make sure that you can take your car on the barge and also make sure to check the barge schedule (greatexpectationsusvi.com/st-john-usvi/trans…) which does not run as late as the people ferry.
We rent on St. Thomas, from a company that rents only new vehicles and who we trust will help us if we were to run into trouble. Amalie is the company. They told us that if we were to have a breakdown on STJ, there is a number on their key fob to call. Their service in general is so fantastic, that I have no doubt they'd carry through if we had a problem.
Click onto the St John forum and top right you'll find a "top questions" discussion on exactly this subject.
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