Trailer parks have always been represented in GTA games as their own environmental category. Trailer 2 reveals they are present in Leonida, inland rather than coastal.
For the rural area in general, see the rural towns piece.
What's visible
Mobile homes lined up in regular blocks. Pickup trucks. Wooden fencing. Yards strewn with the debris of personal life. The same visual coding GTA V used for Sandy Shores' trailer-park imagery, but now it's applied to an environment that codes 'Florida'.
The exact number of trailer parks is unknown. Trailer aerials indicate at least one big one up north of Vice City.
What it's likely to be used for
Story-side: meth-and-money side content has traditionally existed in trailer-park areas. Specific GTA 6 missions are still unconfirmed.
Gives you a sense of the working-class Florida that sits right next to glitzy Vice City.