Trailer Rat
Much the same as a Hood Rat, a Trailer Rat is a girl who trolls the Trailer Park looking for action. This action can simply be for the joy of it, but can also be for the act of trade to acquire goods (often drugs) in exchange for sex.
My friend Danny picked up Krystal, a skeazy Trailer Rat, from a trailer park in Grovetown. She finished up with a previous dude and came stumbling out of the trailer and rode off with Danny for round two.