Have you researched the available mounting options for your Garmin. There are different magnetic mounts that could be mounted where your wife could reach and see it. I mounted mine on my dash by customizing a tray over the vehicle infotainment screen.
The power supply issue referred to if you have an older style cig lighter plug can be resolved by cutting the plug off and direct wiring it to a power supply easily enough. That's what I did.
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2020 Eagle HT 30.5 CKTS Modern Farmhouse (16" wheels, spring shackles set on lower hole of frame, SumoSprings TSS-107-40, standard kingpin, B&W Companion slider, TST-507 TPMS, Progressive Industries hardwired 50A EMS HW-50C)
2019 F250 SRW SuperCab 4X4 SB 6.2 (10,000# GVW) 3.73 Axle 18" wheels
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