Hi Alan.
What is the problem exactly? I have a 2002 SWB 3.2 DI-D Equippe, and it pulls like a train.No stability problems at all.
I tow a 5 berth Avonale fully loaded with 3 adults at the legal limit in England/France.I have never felt even a twitch under any circumstances.
Please give some more information, and will try and help.
Regards Nidge