Towing a car trailer with the van.

[wbute]

is this a stupid question - could a wb 1 tonner carrying 1T in the tray also tow 1.5 times it's unladen mass and still be legal? (assuming tyres and tow bar are rated for extreme weight) thats like 4.5T GCM!!!!!!!!!

Be nice if it worked like that!
You need to check it all out yourselves. It may be possible and I know people do it all the time. I am sure they wouldn't do it if it wasn't legal. But as far as I know Holden didn't give a towing weight for HQ/WB? That limits you to 1.5 times. Towing trailers can be a minefield if you get pulled up. Non rated D shackles on the safety chains is another favourite thing they look for. You shouldn't use a d shackle anyway. It should be a bow shackle. I don't think they worked out that the chain should have been rated as well. Not crossing your chains and no break away coupler on the brakes is a no-no.
My Hilux is rated at 2.5 tonnes. My table top trailer weighs 900kg. So 1.6 tonnes on it.( It tows 2 tonnes no worries.).
That's why the big push on advertising for cars with a 3 tonne rated towing capacity over the last couple of years.