For three trips now we've used the SwiftHitch SH04 model for not only hitching up but also as a rearview camera. This model is their wi-fi version that generates an SSID signal. You can view its images on multiple devices simultaneously. We view the images on our iPhones and iPads.
We mounted the device on our trailer's rear bumper with its magnetic base, though I added a couple of sheet metal screws to secure it completely while in transit. We've been very pleased with the camera's ability to keep me informed about what is behind but not necessarily in view of our tow mirrors.
Real world example from our outbound trip just this past Sunday . . . heading out after church westbound we had to run through some pretty serious thunderstorms with torrential rains. As we slowed along with other traffic, I noticed that my mirrors had been covered in blowing rain and therefore not able to give me their usual good image. Meanwhile, I could see everything behind me very clearly with the SwiftHitch. This, despite darkened skies and headlights on vehicles immediately behind me.
The total distance from the camera's location on our TT's rear bumper to the front of our Ridgeline's cabin is approximately 35'. But we also tested the camera's range on our friend's 29' Rockwood/Tundra combo. The camera transmitted successfully to his driver's seat, also. It's worked well for us so far.
2016 Coachmen Freedom Express 192RBS
2018 RAM 1500 Ecodiesel