I see your fruitPhone 8 and raise my Motorola MB525 'Defy', Motorola MB526 'Defy+' and Samsung J3 which are in use as Wifi-enabled trailer camera. The phones provide a Wifi hotspot through which the camera's images are accessed. Hook up the trailer, connect to the Wifi network and voila, you can see what's happening in the trailer behind you. The oldest device in this list is from 2010, all of them run either Cyanogenmod (MB525 and MB526) or its successor LineageOS (J3). I replaced the batteries in the Motorola's, the J3 runs on its original battery. Oh, all of them run without a screen since that is not visible anyway and was broken in 2 of the 3. Android runs just fine without a screen and using the things this way takes a little less power.
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