Hertz - Triple Rapid Rewards Points with Hertz

Recieved this promotional from Southwest Airlines after qualifying for a free ticket:NOW through March 31,2008,you can receive Triple Rapid Rewards credit and save $15 on qualifying weekend rentals of two or more days.Or,you can recieve triple Rapid Rewards credit and $20 on qualifying weekly rentals of five or more days.Qualifying vehicles are midsize including Minivans and SUV at Airport or off Airport Locations

CDP 205418
Promo Code for weekly rate #996553
Promo Code for weekend rate #996553

I've been reserving for 2 day rents from Thursday through Saturday and reserving other 2 day rents from Saturday through Monday. Its been flawless.

This code appears to only work on weekly rentals. Is there a different one for weekend rentals?

I received this in the mail as well. The Promo Codes are listed as:

Promotion Code #996564 for Leisure Weekend Rentals, or...

Promotion Code #996553 for Leisure Weekly Rentals

This thread in the WN forum (http://www.flyertalk.com/forum/showthread.php?p=5767387#post5767387) has this offer and many more. Personally I prefer to use the $25 off + double credit on the weekends (PC 997076), I don't think that .5 WN credits is worth an extra $10+. Most weekends I reserve a B class from my HLE, I've never gotten anything less than a YC, lately it's been exclusively F or YF, and my total is $6-$7 (it seems to vary on occasion for some reason, but not by much).