Tried Bob1008's L093590 in Skagway, Alaska, and it worked fine, reducing the rate from $67 to $53.

But when I tried it on a weekend day in LA, it quoted something in the mid-$20's (smallest car), but when entering no AWD at all, I came up with $14.99, which seems to be the best rate on 7/23 among any major agency and probably the lowest I've ever paid for a rental day.