Station wagon (also known as estate) is an automobile with a body-style of a shared passenger/cargo volumes, basically it is a variant of sedan/saloon car, but it's luggage compartment is extended rearward and there is an additional fifth door, tailgate, which is used to access a luggage. There is no any difference between sedan and estate over than this, and almost everything said about sedans can be applied to wagons. In the fifth part of Grand Theft Auto series cars with such a body-style, unlike regular sedans, are few in number, at the moment of writing there is only four estates in the game. Station wagons are universal, they can't brag about their speed, manoeuvrability and carcass thickness, yet they are the happy medium at almost everything. If you are not sure what awaits you - choose an estate. And it's cargo hold volume is much bigger than most of other's passenger cars. If you want to learn more about some exact station wagon model in GTA 5, consider checking out this subsection of the website.