I had one in my 63 Shasta years ago.
It was a nice lamp and I actually enjoyed the howl that they make.
Trouble was if I hit a bump too hard going down the road, the mantle would crumble, so I had to keep a bunch of the things on hand.
I seriously doubt that they are in use anywhere today, other than the old units from yesteryear.
In this world of liability and everyone suing everyone else, I don't think they would put them in anymore. They can be a hazard if not used properly. They need a fresh air source and then there is the obvious. Don't put your towel on top of it to dry the thing!