This is purely speculatif, but I noticed that some new superchargers have the traditional piedestal chargers installed on the back of a charging spot, while there is one or two piedestal installed on the side of a charging spot. Typically, installing a charger on a side allows to charge a car with a trailer without needed to disconnect the trailer. However, on the picture below, you can notice that the side piedestals are installed near the back, so a car would need to back up, and there is no advantages for car with a trailer. May be this configuration would be more practical for a car with a bicycle rack, but I still wonder if this would be the only reason? My speculation is that those side piedestals could be replaced in the futur with robot arms chargers, something which would be needed for Full Self Driving cars, or car for driver with disability, since one spot has a disabled sign.