I sympathise. I looked in to doing this a couple of years ago and was put off by several factors:
Ground rent - seems to go up alarmingly evey year
Depreciation - these mobile homes seem to deteriorate very quickly. They lose a lot of money very quickly, it seems to me. And the site owner can demand they are upgraded every few years.
Lack of space - yes, they appear roomy and are fine for a holiday. But for permanent living in - not for me.
Lack of privacy - it is almost like communal living.
But the biggest factor that put me right off was the Committee, with it's rules and regulations. It would be like reverting to childhood, with parental rules to obey 'for your own good'.
But don't let me put you off! It might be just the thing for you. Just be sure you look at all the pros and cons.
Good luck!