I don't have a for sure answer on the wifi for a long 5er.
I was able to walk about 100ft back from the back window camera and still see myself on the iPad. I was able to go out front of the MH about 20 ft and still got the picture from near 50ft, but off to the side with more MH in the way, not the front window see right through, I lost the signal. However, I got behind the truck with camper on it with the front of the truck to the back quarter of the MH for about 35 ft or so and got the signal.
It goes with line of sight but also with barriers in the way what you get. I think at 50 ft it might be spotty, hard to know.
Discovered it has a time delay if that matters for a rear view. I could see myself move and stop, and the picture caught up after I stopped. I counted one, two, but before I said two it caught up.
I mounted the camera on a piece of wood and can move the piece of wood between RVs. You don't need two of the OEM holders.

