Removable car audio system (in the trunk) noob questions

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I have a Subaru Forester and the back plate is not a plate, but a roller. I have it taken out most of the time anyway. I wonder if one could build a removable sound system playing from behind. I guess there is no problem with subwoofers. But I imagine something like PA style speakers - say 8" midwoofer + a horn. One would listen basically to the reflected sound and it could be used only when I am driving alone or with one passenger. That is 90% of the time.

On the other hand, I need to be able to remove the system if I need to transport something. Either as one unit or most probably in pieces. I am pretty sure this was done before. I got this idea, when I had to work in my listening room, where I had the speakers behind myself pointed at the wall in front of my table. That was not bad at all. I imagine one of the cheapo BT enabled 2.1 amps, source is Spotify streaming.

I guess I will need to try something like that. Another limitation is, that there can be no visible modifications to the car (pulling supply cable is OK, drilling visible holes is not.

I would be glad for any input on how good or stupid the idea is and if applicable, some examples🙂
 
Maybe a car is too small for that, but my experiments with reflections and indirect sound in a room had some interesting results (e.g. back to back speakers diagonally in a corner, single speaker stereo matrix, multiple delay diffraction speakers, ceiling firing speakers, etc.)

The door speakers are also kind of indirect sound and there are reflections as well. And the sound is actually OK for where they are placed.