I Braked it...

The caravan has the rear hubs off an HQ or something similar. The Cable operated brake is activated by the weight of the caravan pushing forward on the towball. I noticed this the other day, I'm replacing the part now.... I've also had to throw one of the old rims and buy a new one as it was leaking where the two halves are rivetted together...

Hopefully I should be ready to roll again soon, I think we might be heading to Kalbarri in a few days...