Nope! But this is pretty standard in the industry. Here’s how it works. We’ll show you a typical make/model that the car company offers so that you can plan for the number of people and the luggage space you need. You’re guaranteed the vehicle class once you make your reservation. You will be assigned to a specific vehicle when you arrive at the rental car agency.
Thinking about an upgrade? These are not guaranteed, so your best bet is to reserve the vehicle class (economy, compact, intermediate, standard, full, etc.) that meets your passenger and luggage requirements. Better to have too much room than too little!