The square cabin expansion system (side pull box) is a new technology for expanding the space of the vehicle compartment. Its use expands the space of the cabin and solves the special requirements of the special vehicle. It has been widely used in various fields, such as travel RVs, communication vehicles for broadcasting, field meeting vehicles for troops, command vehicles, monitoring vehicles and other special equipment vehicles.

The system adopts hydraulic transmission as the driving mode, the hydraulic power is taken from the vehicle battery, and the gear motor is driven by the DC motor to generate the hydraulically driven extended cylinder movement. Constant power and smooth operation. The cabin expansion system can be applied to: vans, trailers, buses, etc.