Ja. Die sind leider immer noch kompliziert und es geht mit Kopie immer noch nicht:
You friend can not show a copy of your drivers license. This policy is in place for your protection. If you do online check-in additional drivers may be added in conjunction with online check in. The additional driver will need to be present and meet all other rental requirements. The exit booth agent will check the additional drivers license and add any appropriate fees in the same way as the primary driver.
Aber zumindest kann man den Zusatzfahrer an jeder beliebigen Alamo-Stelle registrieren, muss also nicht da sein, wo man das Auto ursprünglich abgeholt hat:
I did some research and you can be added as an second driver at any Alamo counter. You must show your valid drivers license and sign the rental agreement.