The Jetson is not automotive qualified. If you are building a one-off for experimentation, and are willing to take on the maintenance and risk that comes from using it in that environment, that’s fine. If you’re trying to build something that would actually go into a real car used by real human beings, you should probably be looking at the Drive PX line of devices instead.
The easiest way to get a long wire camera is to use an Ethernet IP camera.
The second easiest way is to use a USB camera with a high-quality long cable, and preferrably a high-quality, powered hub driving it.
The third way to get long cable runs is to use GMSL. I believe someone has a solution with lots of cameras over GMSL for the NVIDIA Drive platform, but I don’t know of anyone with a driver for the Jetson.
The fourth way to get a long cable run is to wing it manually. Assuming your resolution and frame rate is “reasonable,” then you can build a longer cable yourself, or just use a really long flat flex cable.
“pi-cables” is run by a guy in Britain who makes longer cables for the Raspberry Pi camera connector; some of the Jetson camera interface boards (e g Auvidea) use that connector and thus you may have some success with those cables:
(He also does custom orders of custom lengths)