Suspension

What do you hope to achieve?
Why would a 40mm lift make it better on corrugations?
Cheers,
Peter
OKA196 motorhome

If you went for Pedders, you can recieve a GVM upgrade certificate. If you use the other two, you will need to go to an engineer, jump hurdles etc to get the GVM upgrade cert. I originally went with OME through ARB, and they stated at the time they could not give the upgrade cert. I am not sure whether things have changed in the last 3-4years. For some reason, Pedders seems to have tied things up in this area. If you are going to spent that sort of money for upgrading, you might as well go with someone that offers you the GVM upgrade cert and placard to be placed on the door frame. This subject will also open a can of worms.

If you lift the suspension by 40 mm, check first that your CV joints can handle the increased angle as it may significantly reduce their reliability and longevity.

Having done a significant lift on my BT50, I have reduced it somewhat at the front end in deference to the CV joints. I do a bit of real off-roading but not nearly extreme enough to warrant the original big lift I had. I left the rear end where the load is alone.

The car is now better to drive and I don't have to worry so much about shock-loading CV joints that are at extreme angles.

If I were to build my vehicle again, I would still go for a GVM upgrade with heavier but standard or near standard height. For normal touring I think lifts are over rated and over sold.

Lovells sell type-certified suspension and GVM upgrade kits so you don't need to go through the proving process, but you still need to get an engineer's certificate - in NSW anyway.

GarryR's post about Pedders supplying the certificate and SSM plates is the the first I've heard of that - unless it's pre first rego where it's standard with a type-approved kit. Post first rego, AFAIK all states require an engineer's certificate.

That's my understanding anyway.

Cheers

I drive a 76 series cruiser. Like you I find myself on corrugated roads with a hybrid camper in tow quite regularly. I also sought a suspension upgrade for this reason and the fact that I have added things like bullbar, winch, duel batteries and so on that challenge the factory suspension. I also didn't want boiling shock absorbers on the corrugations. I went EFS springs and shocks which resulted in a 50mm lift which was incidental to my requirements. I wasn't seeking the lift as such. I was told that I could get the new suspension certified by an engineer for GVM upgrade if I wanted to spend the money but I didn't bother. My camper weighs less than 2t. The suspension is now over 100,000ks old and I am still happy with it.
I have had OME suspensions in previous vehicles too and I understand it has improved a lot in recent years although I never had any issues with it.

I now have ARB, OME suspension upgrade with 40mm lift. Front springs 200kg (as I have no winch but are bullbar). Rear I had 200kg variable rate springs with airbags but found that it was only level (towing 2200kg AOR Quantum) with 45-50psi in airbags. I have since replaced the rear springs with 300kg constant and run airbags at 20-25psi now and sits beautifully when towing. Springs are fine around town with airbags at 5psi and have good clearance for sand and rocks when needed.