Help!

I am going to be going on a trip to Denver soon. I am traveling with a friend and meeting my brother who lives down there. We need to rent a car (brother has a truck) for the weekend to get around, however the driving is going to be shared. It looks like the companies I normally go with all charge $10 a person for additional drivers - this is like a 50% increase in rental price! Is there ANY car rental companies that do not charge for additional drivers?

There are a few that do not charge for spouse - don;t know any that don;t charge for extra drivers. Perhaps look at some of the local companies?

I don't remember which company it was, but with AAA there was no charge for an additional driver.

Unless you get a special promotion or something, free extra drivers are usually limited to spouses.

It's a complex issue. Some states even have laws about it. In Nevada they cannot charge you at all for a second driver. Some companies include "domestic partner" for free -- but others only "legally married spouse". Some frequent renter "clubs" give free second driver status.
It seems we never used to pay for a second driver with Dollar -- maybe because we are "Dollar Express" members. But I see on upcoming Dollar reservations we would pay $3 a day for extra driver in New York, and $9 a day for extra driver in Florida -- specifically saying "even if Life Partner".

I'm not sure about Denver, but we rented through Costco in Kauai (Alamo) and there was no charge for an additional driver even though the normal charge is $9.99/day.