Just thought I'd add my final decision since it may be useful to the next West Australian who finds the thread and is going through the same process:
After contacting about 30 LPG fitters (who were willing to do a D2) around Perth/Mandurah and spending too many hours on the phone, the best prices I found were:
$4000-$4500 VSI with a tank of some sort in the boot.
$5000-$5500 VSI with twin 308x660 tanks where the original fuel tank is. This was assuming I buy and fit a rear-right-wing tank myself (add $500-800 and a few hours of work for me) and deliver them the vehicle with the original tank missing.
There were some cheaper and some dearer but for various reasons I didn't consider them to be real options.
I eventually chose a 375x900 (usable 72L) which will live in the boot, running north-south on the passenger side. $4000 total from Steen's Automotive in Balcatta.
The loss of boot space is unfortunate, but I decided that $1500-$2000 savings was worth it. At least it'll have a great range. I did try to get a 432 or similar tank because it would have an excellent range but the prices were $300-500 higher because nobody wanted to order the less-common sized tank. Not that it matters, I think I'll enjoy the extra 6cm of boot width and height anyway.
I get it back tomorrow so I'll give you my impressions. The plan is to build a box over it and maybe a removable shelf. The 432 tank would have made this an ideal height in the back (to match the side storage-compartments).
Thanks again for advice given earlier.


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