Second Wireless Cam for Furrion System?

[OneZero]

I am looking at buying the Furrion 381556 FOS48TAPK-BL Wireless backup Observation system for my new camper and truck. But since my truck does not have a backup camera built in, I wanted to add a second camera to the back of the truck for hitching up, and normal non-tow driving. Does anyone know if you can add a second camera to this system? I found a few wireless systems on Amazon and Ebay that come with two camera's, but think I might spend the extra on Furrion just so it would work, if I can add a second that is. Thanks