Air suspension, hadn't had any dramas until now, in fact the 2.8t van towed noticeably better with load levelers attached. However, am aware of LR issues with load levelers, and probably would have got a Mitchell had I known what I know now.
Came through Nambour today, picked up an as new hitch; won't use levelers again, and will not tow anything of this size with my D3 ever again once I get home in 6 weeks unless I shell out for the Mitchells.
Thanks to all for your advice. Very ####### scary situation.
Hamma

