I know what you mean about the rock thing. We have red clay and our neighborhood was built on an old rock quarry so digging for any thing is almost impossible.
I wish I lived in one. When we were looking for a home we were going to get a new triple wide but we did not own any land sooooo... we were going to buy the land and have the home put on the land, well.........the price of all they would have to do to put us in it was going to cost us well over...