There isn't an owners manual of the detail that you are looking for or want anywhere...
Your poor radio reception may be due to a bad antenna, the antenna wire not being connected somewhere, or the plug simply not being plugged into the back of the radio. I would start by pulling the radio (our coach came with the two wire hoops required to do this--they were in the black Thor bag).
If your dash radio is the Jensen JRV-212 it won't have an included remote (I believe you can buy one if you really want one). In addition if it is the 212 there is a camera menu which you can use to check if the camera's have been disabled (and you can use to manually select them). It is also possible that the wiring for the camera's hasn't been connected either (probably not connected at the same time your antenna was not connected LOL).
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