If you know that the location normally has a certain type of car that you want such as Volvos or Prius', I'm not shy about asking if there is one on the storage lot if the Exexutive Selection and EA are full of domestic cars.
Also if you see anything in a different part of the national or alamo lots, they will usually give you that too if you ask. National seems to have a real "please the customer" attitude. I've become nearly 100% loyal to them due to this attitude and the fact that they have some pretty decent imports. I hate domestic cars.