Found this in a caravan forum site. A Nation Dealer Bulletin dated 11 Dec 2011 states that WDH can safely be used with all available suspension types on GC 2011MY onwards. They also found that for Aggregate Tailer Weights above 2268kg that a WDH can assist in the stability of the vehicle and trailer. It goes on to say that 'WDH are recommended for ATW above 2268kg. A poor copy of the Bulletin was attached in the forum.
Cheers
Peter
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