You are going to need the Furrion Vision S Wireless RV Backup Camera System # FCE48TASL-05. This includes all 3 cameras and a 5" monitor. If you already have a Furrion Vision S Wireless RV Backup Camera # FOS05TASF with just the rear camera you can add the Side Cameras # FCE48TASL. The cameras are powered through the running light system on the trailer so you will need to ensure you drive with your vehicle running lights on to power the cameras. You may need a 7-Way Vehicle Power Adapter... view full answer...