I have a lwb series three here with parabolics and i will get under it later and see if it has any issues regarding clearance. When I picked it up a couple of years back I drove it part of the way home, some of which was on an outback road. It did not have any issues with clunking or knocking of the drive shaft.
I have parabolics (don't recall the brand but they are blue) on my series three shorty and they are great.
Cheers, Mick.

