Can I upgrade to a different car at the rental counter? November 12, 2018 19:14 Updated Upgrades can be requested at the vehicle counter, and are based on availability. Additional charges may apply. Related articles Can I make changes to a guarantee room on my cruise? What if I need to make changes to my cruise reservation? What are the benefits of booking my next cruise while on board my cruise? How do I make a special room request on my cruise?