I like the term "HBL category." Now that I have heard it, I am amazed that in my 23 years in the military, nobody I know ever came up with that one. I could see that taking off like wildfire in daily military speak. I can think of a number of times when that would have been useful in a discussion.
I too am interested in the RV questions. I rememeber that an RV or camper is effectively considered your home/house under certain laws, but would have to go look it up. This should be an interesting series of discussions.