A little Googling reveals that the largest standard PVC pipe available in Australia is 315mm outside diameter. Fairly close to what you want.

You would have to do more searching to find a source for this pipe. Once you do find some I suspect the price will be a bit - probably a lot - hefty!

Murray

Try contacting (Phone, Email, Visit)  one of the PVC Pipe manufacturers with your query.  E.G.  Iplex, Pipemakers,  Pipeking, Vinidex, etc.  I just Google"d  these four, there are more.  Find one near you.

 

I worked installing a lot of extruding machinery in a new plant in Canning Vale, WA  about 6 years ago.   In the process they have wastage that is not up to spec. All sorts of sizes get  scrapped. Depends what they have been making, You just might score what you want.

 

 

Mike

I built a large PVC tube for the rear of my caravan to hold annex poles and my fishing rods....most of the gear I obtained from Bunnings, <they had plenty of various PVC pipes in their stormwater/plumbing section.. however the rear brackets were from an Ebay seller...same seller used to sell the pipes as well on Ebay..delivered promptly by Courier....I screwed one end on and used blue pipe sealant/glue and the other end I riveted a secure/strong latch with lock fitted to a screw cap.......as a tradesman I'm a good fisherman however it came together nicely...very secure..wasn't really dear with all components about $75 odd....good luck...
Hoo Roo

 

Back to the drawing board...I just measured the diameter of my PVC tube..only 150mm......length no problem..just the diameter..holds all my rods and poles...any larger and there would be too much underhang reducing my ability to clear some of my prospecting roads... 

-- Edited by Goldfinger on Monday 30th of March 2015 04:22:02 PM

Alan may have the idea - don't forget to talk to them about a good locking mechanism. Some Parks and free camping areas suffer from thefts of anything not locked up or down

If you were on the Gold Coast I would give you a off cut.

Goldcoaster - wish we lived in the GC - would be at your door instantly! Have tried all plumbers, irrigation specialists, hardware shops etc. Seems not many people use large diameter pipe here. BUT good news is someone has a 'friend' who knows someone in our local water supply [council] and is checking for us.
I really appreciate helpful suggestions from all.
Put a plan in to a local metal fabricator and he called back asking how much we wanted to spend and said the labour is over $500 !!!
Bruce & Bev - we have taken the tent in the van but my wife is over jumping it! If we just have a one night stop we don't put it up. We used to have a Falcon and it fitted in the boot with the 1/3 back seat down, quite convenient but now have a Mazda BT 50 and it won't fit in the tray.
After all the negatives I have to say what a good thing the Oztent is. We have a caravan connector so when we put it up it makes a breezeway and spare room. Much quicker to put up than an annex.
Thanks again everyone - will keep you posted.
Terry
[also a retired radio/electronics tech]

Old Col - thanks for this - it is a different brand to the ones we have looked at, will investigate. Appreciate you looking for us.