Kangaroo Island (SA) 4WD Tracks

DP,

Just come back from a 4 day visit a few days ago.

Not sure what you mean by 4WD tracks. They are plenty of dirt roads and tracks on the Island to give you the experience of driving on unsealed roads.
The whole of the area north of the Playford Highway, (Bitumen) including the North Road that runs between Kingscote and Stokes Bay is unsealed track. During December/January there would unlikely be any rain so the condition of the tracks would be good, although some may be corrugated if travelled heavily.
We experienced a variety of driving conditions with some "boggy" sections. Really good fun.

Virtually all of the minor roads and a few of the more major ones running north-south and connecting the two east-west bitumen roads (Playford Highway and the South Coast Road) are also unsealed.

In Flinders Chase National Park, the West Bay road connecting the most western point of the Island to the bitumen would be a good one to do. I intended this "trek" but a few days of rainy periods had caused the closure of the track when I was there. The map shows a 4WD track from just out of West Bay running through the Ravine Des Casoars Wilderness Area up to the bitumen road at Scott Cove, near Cape Borda, which could be worth a try.
If you asked at the Rangers Station or Tourist Center within the Park, they should be able to advise you if its do-able at the time.

All in all mate, you should enjoy your trip. Plenty to see and do.

One really pleasant surprise we experienced.
We did the "tourist" bit and visited Admiral's Arch at the bottom of Flinders Chase, although the bride and I had been there before, many years ago.
We walked down to the Arch along the access path and was amazed to see literally hundreds of NZ Fur Seals and Australian Sea Lions in their colony, sunning themselves on every available rock and open space and swimming around in the water. At this time of the year the breading season was well under way and there were plenty of pups of various sizes mooching around and playing with each other and generally annoying the grownups, while waiting for mum & dad to return with a feed of fish.
We could have spent much longer than the hour or so we stayed there witnessing a truly close encounter with nature at its very best. At times we were only a few metres away from some of them.

We didn't bother with a trip to Seal Bay after this as one can only go on a guided (escorted) tour at Seal Bay in a Group and that was not for us.

18 months ago we spent a month camping around the Is. All we did was accessible in 2wd, and we were actively searching for challenges. I suspect that if you want to 4wd you will have to talk youself in with the locals and get access to private property.
The gravel roads however are well made but slipperier than most and often corrugated. We found 4wd and lowered yre pressures helped here.
To escape the crowds go to the west end to Flinders Chase and camp. Keep away from the bus routes and one-day-tourist spots.
You will encounter some wild places this way and have a ball!
Camper