Mike I consider myself real and at the same time have often run a 5 KW generator sitting in the back of my van.
As has been mentioned keep combustibles away from it and use some common sense, I don't generally start the generator jump inside the van, close the doors and settle in for a nap.
When I do this the exhaust is aimed out the back door with all the other doors open.
The generator gets shut off when I have to move I really do not see an issue.
Bob