Alamo.. They have two location onsite. One at the Dolphin the other at the Car Care Center. You have to call them at least one day before your rental to have them pick you up
There's a whole "sticky" thread on this subject at the top of the DISboards Transportation Forum. The short general answer is that there are many other options in addition to Alamo at the Car Care Center (CCC) and WDW Dolphin. Alamo/National at the CCC is one of the rental offices on or near WDW property that will pick you up and drop you off during business hours.
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