Gawler Ranges National Park in a motorhome - road conditions

Hi all - we are travelling to the SA west coast in the next week or so, and considering at spending a few nights in the Gawler Ranges National Park. We'd be coming in from Kimba, staying a few nights at Waganny campgound, then leaving on the road to Minnipa, so basically just driving the Old Paney Scenic Route. We have a motorhome, so rear wheel drive with reasonable ground clearance, but quite a long rear overhang & poor ramp-over.
The park's website says this road is suitable for "high clearance 2WD". Has anyone here been on this road (preferably recently), and can provide some info on the condition? Happy to drive on reasonable dirt roads, can live with some corrugations, but will struggle if there are any creek crossings or silmilar that will drag our overhang.
We have a scooter to get around once we are in the park, the motorhome will only drive the scenic route road and into the campground.