So, I buy a mobile apartment for $X and then pay a berthing fee to some building owner for $Y a month? If I want to move, I haul my apartment to the next building?
No, no, that would be an RV or mobile home and we cannot have those people in our neighborhood[1].
On a serious note, I am intrigued by the concept of pluggable apartment buildings with varying amenities with varying "berthing" fees. I buy a standard sized apartment model that fits with the layout I like. I cannot see it for families, but it would be an interesting idea for single / couples.
1) considering my Parent's trailer was a lot better built than the HUD house I grew up in there is some sarcasm in that sentence.