Saw one of these in a state park. The family had like 8 kids and from the looks of their truck and travel trailer they were on a budget. They had one of these rolling around in back of the truck, set it up and cooked fish over it.
It seemed to keep the little ones from playing in the fire. I've had a trip nearly ruined by children putting all sorts of crap in their daddy's fire. (While daddy did nothing to stop it)
Probably works better in a fixed installation like this one.