One thing that I appreciate more than I expected was a couple USB outlets in the dash with integrated volt meters. One hooked to the chassis battery and the other to the house battery. Simple project that added more needed charging outlets and also the ability to check the voltage of both systems at a glance. This project started because all 4 of my USB outlets in the bedroom died and while shopping for replacements I found the ones with displays.
These are they ones I got:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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