Caravan ATM Upgrade

Guys,
I have just finished a GTM upgrade in NSW and want to share the experience which was easier than I thought it might be.
1. Check with the manufacturer (Van and/or Chassis) what the chassis is rated for and what is required to effect an upgrade, in my case neither Lotus or G & S Chassis were at all helpful even when contacted by the certifying engineer.
2. Go to the RTA web site and identify a certifying engineer in your area and talk to him to ensure you can work well together.
3. If the chassis will carry the extra weight proceed but if it requiress modifications sell the van and buy one that is suitably rated.
4. There are some key factors that will limit the GTM as follows:
a) Axle (s) if twin must be load sharing;
b) Wheel Bearings;
c) Brakes;
d) Springs;
e) Wheels;
f) Tyres;
g) Hitch, and
h) Safety Chain(s).
5. Get hold of an Al KO catalogue on the web and look at the ratings of each component shown above.
6. Check and measure each component currently fitted and find out what each is rated at.
7. From that you will have a list of components that are below the limit you are targeting.
8. Check with your Certifying Engineer for his agreement with the list of things to be upgraded and to what spec.
9. Buy and fit all the required parts (or have them fitted for you) in my case it was four new higher rated springs.
9.a) Take the opportunity to replace anything else you find worn whilst you have the parts off the van.
10. Get a Tare weight weighbridge ticket, IE no water, gas or luggage and gear.
11. Have it inspected and tested by the Certifying Engineer and correct any issues he identifies, and
11. Take the paperwork with the rego papers to the RTA and get the upgrade documented.

It sounds like a bit of mucking around but mine took 4 weeks start to finish and cost about $1600.
Gundarooster