I’m brainwaving a vehicle setup too, so here’s some stuff to consider from what I’ve learned:

• Rak with gps in an IP67 box attached to the roof rack. Rak for the low power draw -Gizont 20 or 40 cm whip, because my vehicle is tall and I don’t want a rigid Alfa or something getting sheared off in a parking garage.
• you likely know this already but better to not cable from a node in the car to antenna on the roof- keep them together.
• look at the Rak green power module, which will accept 12v directly from your cars system and convert to a stable 5v. With a 3000+ size battery in the box , you may not even need a solar backup as the car will top it up as you drive. If you want it to run while the car sits for a week +, then maybe a solar in addition is better for you. -if you want zero fuss, you could also wire up an external waterproof reset switch

I thought it would be kinda cool (though unnecessary) to have a display wired inside the car from the roof…. Anyone done this, know if it’s possible, or know the limitations of cable length from a rak baseboard to a display?

Show us what you come up with!