cooking facility on your vehicle

Looking for some help with a search, as anyone else seen, or know where you can get, those rear mounted cooker/bbq setups mounted on the back of 4wd wagons ??
Looks like they would be good idea for when just tenting/swagging it or for day trips.
I went past one on straddie, family all down fishing at dawn, and mum was cooking up a brekky on the back of the GU patrol on the beach.
I meant to pull up and ask but that was our last day and did not come across that vehicle again.

I have looked on the net but no luck.....any ideas??

I described it to one of the blokes at TJM and if they had seen one, he said he pulled next to bloke with one at fraser one avo on the back of a LC wagon cooking up dinner for the kids as they swam in Eli Crk.
He got a bit closer look than me, and said it certainly looked manufactured, not homemade, they seem to mount on some type of swing arm in place of one of the spare tyre carriers and swing out/unfold, his had a weber Q in it !!

Anyone know where to get them or how expensive they are ??