I need a decent video camera setup in preparation for targa Tasmania next year. Does anybody have a recommendation for multi-camera (min 2 cameras) in car video that is good quality and reasonably priced?

GoPro is your best option. worth paying the extra $$ 
been using GoPro for the last 6 years.

yeah gopro do great video, though their audio has a lot to be desired.  i believe there are some external microphone setups out there.  want to try one (external mic) myself.

i have a gopro wanna be and sony and goPro black3+ 
the cheap one is just for back up. 
dont waste your money on anything ells accept GoPro.
you dont have to by the new Hero6  if you dont wanna spend the extra money. just go for for hero5.
i have 3+ black and its about 5 to 6 years old at 60fps 1080p the quality is amazing.
also you can buy a lot of accessories and attachments on eBay  real cheap. also but an external Mic and run the mic at the back of your car for good sound with out wind noise.
i can show you some of my videos if you like.
 
 
 

^^^^ In for videos!! haha
 
 
this only sounds ok as i had it externally mounted and the open back case on the gopro.   (headphones advised).
https://www.youtube.com/watch?v=PNoTCpsWMqg
 
where as a incar track vid with a external skeleton casing have, you can just hear that rattle noise they all seem to have?  oh, and the dag of weld going side to side in the harness bar... hahaa
https://www.youtube.com/watch?v=rS_2J1x2QHs

Here is mya quick short video
you don't hear and rattle noise.
I think it's from the way you have mount your camera.
Make sure every thing is really tight.
I use genuine GoPro suction mount.

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http://cloud.tapatalk.com/s/5aed834a1489b/TRIM_20180505_201011.mp4

Here

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