google RVrearviewcamera and check out their video on 'real life scenario #1'.
We evaluated all of the major makes but wanted to avoid a wired systen and drilling into the skin. It establishes a digital, wireless, hot spot with a 12V router, camera and uses ones smartphone as the monitor. good luck.
sorry for the double post. posted the first and it wasn't listed right away (thinking GS doesn't like websites listed) until the follow up one was written without the formal website.
good product with reliable wireless range. again we have a small collapsible TT and the router is just inside of the tailgate and the camera mounted on the AC shroud (only wired power to camera is via the tongue battery pigtail and only power to the router is via a cigarette lighter receptacle) is 20' from the router. The signal is indeed digital-wireless.