The key takeaway is that many/most of the people living in this kind of housing cannot afford the expense of moving it (video gives a price tag of around $5000), especially on short notice. Older mobile homes may not have enough remaining structural integrity to be moved at all. Meanwhile the land their house is on is rented and they can still be evicted from the land at anytime which typically results in the loss of the home that they "own".
This catch 22 means that residents are seen as ripe for rent and fee increases since moving means losing their investment in the home.
I'm sure mobile housing is great for middle class people looking for a nomadic lifestyle where they plan to move their home from time to time. As low-income housing though, it seems mobile homes are in a nasty grey area between renting and owning.