Leaf spring resetting

G'day there,

Over west for a few months travelling and loving the countryside. So far have really soaked up the southern WA National parks. Geez, they're doing a good job with some of the facilities, especially aloing the Bibbulman Track route. I seem to have an uncanny knack for finding the most corrugated tracks leading to the places with greatest volumes of serenity.

Towing a Heaslip camper behind the 100 series and have found that the left side of the camper is starting to sag. My guess is that it's due to the water tank being on that side (75 litres = 75 kg). Will be in the area from Augusta to Perth for the next 2 weeks. Can someone recommend a place to have the springs tested and possibly reset?
Goodonya and thanks

JimB