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The usual configuration when I operate mobile in my 2016 Honda CR-Z is Kenwood TH-D74A running off of a three-port 12V extension outlet that includes a built-in voltmeter run to the ignition-switched 12V car outlet. The 'D74A is used for APRS on one VFO, and D-STAR, FM phone on the other. In a pinch, I can retarget it for secondary digital operations (such as Winlink to an Android tablet). The radio is connected to a head Lido mount attached to a seat bolt.
If I need an APRS client, I run APRSdroid on a Samsung Galaxy Fold. When I do that, APRSdroid connects over Bluetooth to the TH-D74A. Normally, though, I just operate the 'D7A as a stand-alone tracker.
For antennas, I use a couple of dual-band low-profile magmount antennas, one dedicated to the radio, and one in case I bring another 2m/70cm radio with me. I can't remember who made them; they've been moving from car to car to car for about fifteen years. I would not be surprised if they are from MFJ Enterprises, though. The coax runs along the center console, along under the back cargo shelf, and then up and through the rear hatch and on the rear of the vehicle.