This may be of some use, I pulled into the service station on Bollard Road in Tuakau, the one just down from the saw mills, Wecks grain and from the other direction, not far from Whangarata Road. It has an LPG pump service for those vehicles that run on the stuff.
many thanks for the info, that was the one we discovered when we had to get the gas bottle refilled and the other half was happy to see the pump. Heaps cheaper than running a vehicle on fuel, his is dedicated from the factory, meaning it never ran on petrol at all..