Has anyone else noticed that National seems to now consistently ask what credit card you want to use when you're at the exit booth? It's very strange, as I always select my card when making the reservation. But now they say "I see you have a Visa and two Amexes on file. Which would you like to use?" Any tips on how I can get my credit card to "stick" on the reservation? I'm concerned that the exit agent might accidentally pick the wrong one which could be an issue with say a work rental.

They also seem to consistently e-mail out a PDF of the rental agreement when checking out. That seems to be new, too.