I thought I would share my experience, perhaps it will help someone.
Booked a Full size rental from noon friday to noon monday (3 days) at ATL
shopped a bunch of diff codes and ended with this
AWD: K563500 (upromise) + coupon TUEA005 (visa cardholder 3rd day free weekend)
priced out total at 82.03 incl tax etc.... + I will get 5% upromise cb.

A177232 (USAA) + TUEA005 = 86.00 and includes all the bennys including LDW.

I tried all the other usual suspects mentioned and couldn't get it lower - perhaps if I hammered away harder at it....

these are all public codes and stated plainly on the associated websites for those wary to use codes that they feel are in the grey market :-)

everyone here is fabulous! I love the info.
infrequent poster long time member. -keth