After a short stay in Las Vegas, heading east to San Francisco, you'll pass through many small towns

I took the HERTZ company bus at Las Vegas airport to pick up the car. The staff had a very bad attitude! They told me the Toyota 4Runner I booked wasn't available, only a smaller Hyundai Santa Fe SUV. If I wanted a different car, I'd have to pay extra! There was no way to get another car without paying more! Due to a tight schedule, I had no choice but to accept. Then they asked me to buy insurance, and I said I had already bought all the insurance through the rental platform, but they said their company did not recognize that insurance. After calling the support line in the US, everything was sorted. When I swapped the car in Los Angeles fifteen days later, the process was smooth and took less than five minutes, and they even provided a direct ride to LAX airport. I want to ask the rental platform's customer support: Are the booked and actual cars the same class? If they are, why is there such a big cost difference?