I used to go for a fish down at skinners off the pontoon for sharks when i lived in brissy. I definately wouldnt be leaving my car and trailer there overnight, id even be hesitant about weekday trips due to the ramps isolation but i can be pretty parnoid about that stuff, cant trust people these days unfortunately.
I cant comment on the carbrook ramp sorry.
Hopefully someone who fishes the area can pass on some more info for you.
Cheers,
Zane.