Amazing find, emeraldtx! How on earth did you manage to dig that up? (ETA: one way would be clicking on the current page link from the cached snapshot linked above; the current page link used to return a 404 error.) It currently appears on neither the rapidrewards.com promotions page nor the southwest.com car specials page. You should post this on the rental car promos thread!

To answer your question, the RR 2.0 transition rules are clear that any earning activity that occurs prior to 01-Mar but that posts after 28-Feb will be converted to points at the rate of 1,200 points per credit. So a four-day rental earning 2.0 credits would post as 2,400 points if the transaction posts after 28-Feb.