Three Roomates, Two Rooms… Asking For A Friend

Really, asking for a friend. I am fine.

A friend of mine lives in a 2 bedroom apartment with a couple. The rent is split $750 for one and $1200 for the couple. Utilities are split 3 ways. There are two parking spots. Now, the couple is asking for more access to the parking spots instead of splitting them one per room. Even worse, they want it to be first come, first serve. This would be horrible for the single person as they work long hours and would never be home in time to use a parking spot.

How do you resolve this problem? Please help as I’ve never encountered this situation and am not sure what is standard protocol.