I've got this waiting to be installed... Picked this one as I have an available 'knowkout' this shape/size in dash.
https://www.amazon.com/gp/product/B072QZPKLG
Plan to tap off the radio power - receives chassis power for 'keep alive' (always on) and house power for operation (use/store on)
Plan to add a relay that will only energize the chassis side of circuit when use/store is in 'use' - to not become a full time drain on chassis battery.
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