Mike replied:

Steven, the fact that you vehicle is sagging should tell you that you are overloading it in it's present form. Do yourself a favour and replace the springs with H/D units. Not only will you carry the load more easily, but your vehicle will also be a lot safer! Another thing that tranformed our Jackaroo was 'No Bull Susension Supports.' These rubber blocks help as over-ride springs and also improve the handling immensly. Happy trails, Mike.

Mark replied:

Hi Steven. I have a rodeo with a similar problem. My ute is a single cab and after I bought it and loaded it with a few tools, it sagged. I looked at Pedders reseting the rear springs, then asked my Holden dealer if it would void the warranty. As it turns out saggy springs in Rodeos are a fault that Holden are aware of, so they had them reset under warranty! (I bet they don't want that to be common knowledge). However that is fine with my normal laod of tools and gear, but as soon as I put anything extra on, it sags again. When I took it back to Holden they said that I was overloading it, but I put it on a weighbridge and was actually 400kg less than the GVM. It seems strange that the car is given a GVM that it is not capable of handling. Anyway, I went down to Pedders and they offered two solutions. 1. is a Load Ryder which is a horizontal coli spring which only comes into effect when the extra weight flattens your leaf springs.2. is airbags, which you pump up at the servo with the air hose. This way the more pressure you put in, the stiffer your suspension is. I haven't actually put any of these on. I suspect but don't actually know for sure, that the load ryder may affect the spring action when off roading. So I'll either go for another reset($0 under warranty) or airbags (approx $400). Hope this gives you a few options!
Cheers.

Mike replied:

Steven, I had ARB springs fitted to the rear and the torsion bars reset to give about 20mm lift. At the same time I fitted OME shocks. Empty there is little difference in the ride, although it is a little firmer. the 'No Bulls' can be found at 'www.heslipcampers.com' under accessories. The difference they made to our Jack's handling was amazing and you don't have to adjust them or worry about them puncturing. Happy trails, Mike.

Mike replied:

Steven, I had ARB springs fitted to the rear and the torsion bars reset to give about 20mm lift. At the same time I fitted OME shocks. Empty there is little difference in the ride, although it is a little firmer. the 'No Bulls' can be found at 'www.heaslipcampers.com' under accessories. The difference they made to our Jack's handling was amazing and you don't have to adjust them or worry about them puncturing. Happy trails, Mike.