Mobile home are cheap, about 1/3 the price of regular homes. However, regular homes appreciate in value, manufactured homes generally don't. You will buy a manufactured home for X, live in it for ten years or so, and sell it for X.
There is a high HOA for a mobile home park. However, compared to renting in my area, it is about half the price of an apartment, so you would still save over renting.
So, while the house itself is not a good investment, you can take the money you save vs. buying a normal house, and invest that money in other investments that do provide a return.
Also interest rates are starting to rise, and this will eat away the equity of normal homes. but since mobile homes don't appreciate much, they probably wouldn't depreciate due to interest rates much either. So if you are in an area where normal houses are not appreciating, and interest rates go up, a mobile home may be a better defensive investment and provide a better return.
Hardly any banks will loan on a manufactured home anymore. Also can be tough to find an insurance company to insure you, although there’s always one somewhere....