Right out of the airport there are shuttle buses lined up directly across the street who jump on the shuttle and it takes you to the rental building
Yes, there are shuttles, and it is well marked. They are directly across from the building you exit from.
Yes, there are free shuttles to/from the airport and car rental center. I found the signage directing you to the shuttle curb to be easy to follow.
Yes they do have shuttles you should call them an find out what terminal they have them
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