Found this video the other day looking around at places
also Wellington dam has a power lines track but would check with locals to see what its like at the moment.
I went up Adelaide track the other day Adelaide Track - 4x4 Earth Australia for...
I thought there was a post in the ground about 15meters before the estuary warning people about crossing (I haven't actually read it) and if you drive onto the beach at wonnerup access there's a big sign saying from boat ramp to estuary is where you can drive.
The other day I went looking for places around Perth to go 4x4 and found Glen Mervyn dam and then the news report from earlier in the year.
"A BOAT owner who complained about two boats racing on a dam at a popular campsite was attacked and left with a broken jaw and nose and suspected skull...
Hema have a book out, Day trips from Perth, haven't got it myself yet but will do soon.
4-wheeling-in-western-australia.com/dwellingup.html page might be of interest to you. Cant link it as a hyper-link just yet.
Picked up the Challenger on Friday night, I am stoked to have it.
Took it for spin to Perth on Sunday. Just working on what needs to be kept in there as essential, got the tool box, and going to get a first aid kit and fire extinguisher.