I also use the Ampfibian unit to convert power to my camper trailer it's pricey but a great little unit I wouldn't use it if it was unsafe or could damage my camper.
Here's a copy and paste from there website.
Yes, Ampfibian is approved under AS/NZS 3190:2011 “Approval and test specification – Residual current devices (current-operated earth-leakage devices)” which includes portable RCDs, and its use complies with AS/NZS 3001:2008/Amdt 1:2012 “Electrical Installations – Portable structures and vehicles including their site supplies” which covers caravans, campers and motor homes… beware cheap imitations that don’t comply with that one!
Best of all it is approved for member use by the “Campervan & Motorhome Club of Australia Ltd”
There has been a lot of confusion about standards regarding caravans/RVs, extension lead lengths and capacities, portable RCDs, weatherproofing, impact resistance, etc., but after years of research and advice from standards experts and approval authorities, we can categorically state that the Ampfibian is the only legal way to connect your 15A RV/caravan to a 10A power supply in Australia.
The new and improved RV-02 MAX is tougher inside and out, and now carries a H-Class rating, allowing it to be used on construction and other commercial sites, mine sites, and for the heavy industries.