Strongest Outback models were made from 2002 to 2005. Aluminium frame and body with a 6" draw bar. Later models are timber frame? Fiberglass body and 4" draw bar.
Our 2002 OB Finch has been everywhere with its stock OB leaf spring suspension, from the Tanami Road, through the Kimberlies to Warraweena in the Flinders to the sands of the Murray Mouth.
780mm under floor clearance seems higher than most and being a Finch, never had issues with departure angles.
Always inspect and service things like suspension, bearings and brakes prior to those outback trips and as said previously, drive your rig and camper to the conditions with correct tyre pressure and speed and you won't have a drama.
We didn't want to spend big $$$$ on a caravan as we were taking to places caravans won't get to and the Australian made camper trailers like the Kimberley Kampers are just way over the top in price.
The width of these Jayco OB's are great if you're over 6 foot tall, you can lie in bed and still have a bit of room.
They also tow great off road.
Having said that, I have found that there is no perfect camper on the market for us, unless I build it myself