I doubt that you will find a reliable way to see the backup camera from an Ipad or the Fire tablet, even if the apps exist. You would need another device to convert the RCA input over to bluetooth and then find an app that is specifically designed for that purpose. The cheap Axxeras they stick in these RVs certainly can't do it. I replaced the stereo the very first week of ownership. Bought a Pioneer with Android Auto capabilities.
The simplest solution would be to purchase a small 7" monitor and mount it to the dash. Unplug the camera from the stereo and into the monitor. For power I used the red lead from the stereo. Wired it into a on/off switch so I can easily turn off the monitor. I think I paid $70 for the monitor. I'm sure there are cheaper monitors but the one I bought can actually display four inputs at once. I might eventually add some additional cameras.
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