Can I use the G5 System Adapter without a Stroller? September 27, 2022 16:35 Updated The G5 System Adapter must be used with the stroller base. It is not stable unless docked into the SmartHub on the stroller. Related articles Which car seats are compatible with the G5 System Adapter? Which direction should the car seat be docked into the G5 System Adapter? Can The G5 System Adapter be used in a car? After-Crash Car Seat Exchange Program Why doesn't the Stroller Seat lock in side-facing position?