On a lot or behind a house?
I am confused whether you meant behind a house or on a seperate lot in the neighborhood?
I am currently doing it in Memphis, TN. I live behind a house on a concrete pad. It just looks like someone's RV, I could claim that I was living in the home if push came to shove.
I plan on doing the same in Nashville, TN. I know it would be possible there.
It all depends on the neighborhood. Almost everywhere will have restrictions on people living in RV's in neighborhoods, and probably for good reason. But if your trailer is an addition to the community rather than a detriment than no one will mind.