Bungle Bungle Caravan Park is at the turn off to Purnululu National Park on Mabel Downs Station, 750m from the highway. It's owned and run by the station owners. The road to the caravan park should be accessible for 2WD.
Bungle Bungle Expeditions is part of the same operation and offers day tours to Bungles ($395 pp), 4WD station tours and helicopter flights over the station and Bungles.
I have written about the Purnululu National Park and shared other photos in Kimberley: Outback Western Australia. Caravan Tour with a Dog.