This is my JENSEN RADIO setup in my OFF-ROAD POPUP.
The Jensen FM Radio has its own radio ON-OFF push button that when operated will completely shut down the radio and disable all of the presets-everything etc...
My idea was to add the ACC-IGNITION switch that you see to the right of the Jensen radio.

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When I show up at new location then I turn on the main radio push button switch and the ACC-INIGITION and set the different push buttons station selector. When I get ready to turn 'OFF' the radio after doing all of this I will only use the ACC-IGNITION switch on the right side to turn off the radio. Leaving the main push button for the radio 'ON' keeps all of my push buttons settings for this location active...
I use the FRONT-REAR Slider speaker control on the Jensen Radio for the Inside-both-outside speakers on my trailer...
To listen to the FM RADIO I just flip on the side switch and continue to use my station push button settings...
When we go to a new location we have go through all this again..
Clear as mud huh...
Roy Ken