A little Googling and I found this from National's website...
If requested when reserving the vehicle, National Car Rental will deliver a rental vehicle to any Emerald Club Executive Elite Member arriving at any Fixed Based Operator airport facility ("FBO") located within fifty (50) miles of a National Car Rental facility, subject to (a) payment of any delivery and collection fee, (b) payment of a no-show fee if such Member fails to show up for such reservation, and (c) the individual FBO rules and regulations.
I called around and the drop fee for the car is either $25 or $50 depending on the mileage to the FBO from the nearest National location.
Since I can rent the car in Tacoma from Avis for $28 all-in, I don't think this is going to work for me.