In GTA V the Rancher is only available in an "XL" variant, with longer wheelbase and 4 doors - reminiscent of the FBI Rancher from GTA III-era games.
A snow-covered Declasse Rancher XL, called the Police Rancher in-game, is used by the player during the Prologue mission. This particular variant has snow on its hood and roof, and features snow chains on its tires.
Can be found around the lone building on the far southwest end of the Los Santos Airport and behind other Hangars on the south end. Due to the immediate wanted level a Rancher here can be hard to obtain without owning a hangar.
It can rarely be found driven around the streets of Los Santos.
The snow-covered Rancher XL used as a getaway vehicle during Prologue.