Very soon to be heading east from Perth. A week ago, I thought of having a roof top aircon fitted to my 1991 Mazda T3500 motorhome. I emailed 4 different companies here in Perth, re. fitting and pricing, etc.
Had a similar situation a couple of years ago. I visited the dealer we purchased our van from to get a quote to fit a diesel heater. Price was about $700 roughly.
But could not accommodate us for 3 to 4 months. Yes so business must be great.Ended up in stalling the heater myself.
Moral of the story.
Saved heaps of $$$$$
and great satisfaction on my ability to install the heater.