Other Car Rental Programs (ie. Alamo, Enterprise) - Combining two Alamo reservations

Hi, being an Alamo newbie I was wondering if one can combine two continous reservations (Wednesday-Thursday and Thursday-Sunday) without having to return to the rental location (same type of car). Just signed up for Alamo Insiders if that helps. Got a great weekend rate for the Thursday-Sunday reservation but need the car on Wednesday afternoon in Washington, D.C. :confused:

Thanks

If it is not too late for me to reply. It has been my experience Alamo (and all others) will make you return to the rental counter. If you want to keep the same car tell the check in guy you have a second reservation. I am usually able to keep the car on the new rental.