I think what people think they're seeing "all the time" are actually a form of trailer home, but ones that aren't meant to be "trailed" anywhere like behind a car. I knew someone who lived in one. It was the same size as a small house, had the same configuration inside, as opposed to a motorhome/campervan. But it could be moved to other trailer parks.
The house I saw was a regular wooden house with a porch, meant to stay in a neighborhood. Apparently this style of home only rested on its foundations rather than was built into the ground. They had loaded it onto a huge flatbed and were driving that down the road, very, very slowly.
As for that picture of the deer where someone tied that balloon to it -- I don't find that ONE BIT funny.
What kind of sick Fck would laugh at that? Tying a balloon with that message to a dead animal is just devoid of all respect, to me. It's not that the animal got hit on the road -- happens. But nobody needs to make fun of it. I don't care that the ANIMAL doesn't know. We see it, WE know, and it's just pathetic, childish and sick.
I'm not into people doing sick, stupid things to mock a dead creature or get humor out of it.