I would consider living in any type of "RV" fulltime: 24/7/365 even if it is a trailer that is set up semi-permanent.
I know some folks say that being on the road a certain amount of time is considered fulltime and some don't consider living in a campground in a trailer fulltime but...its just a matter of opinion!
If someone lives in an RV even it it never moves then they are fulltime "something". If they live in a house or apartment part of the year...well it gets complicated.
I don't worry about it! Everyone is free to call it what they will.
However insurance companies sometimes do mind and consider someone fulltime if they spend all of most of their time on the road or in an RV park...check with them to see what they say.