I have not. We really don't have any of those around here, trailer parks I mean. I think the closest one to me is about 40 minutes away. It is regarded as more of a retirement space than anything.
I have not but my brother has. It was his own. He started out with his first home being a trailer home, double-wide. It was a nice one as well but he wanted a yard and privacy when his wife got pregnant so they sold it in about 3 months time and bought their first official house together just after selling it.
I have sold one, and just one. It took me almost a year to do it. There is not a huge market in my area and I though it would be an easy sell. It was going for $39,000 for a double wide which to me is a good deal.