RP_SouthSide V4 is a comprehensive mod for Bonelab, designed for Windows users. This mod introduces an expansive map set in a fictional town located in downtown Union City. Key features include a police station, multiple apartments, a motel, a diner, and a variety of enterable buildings such as a bar, fire department, and courthouse. Additionally, players can explore a large suburban neighborhood filled with houses, a gun store, and a clothing store, contributing to a vibrant gameplay environment.

In terms of technical enhancements, RP_SouthSide V4 boasts a well-implemented navigation mesh, effective render occlusion for improved performance, and baked lighting for a more immersive experience. The mod aims to optimize gameplay while providing a rich assortment of locations to explore and interact with, making it a noteworthy addition for Bonelab enthusiasts.