Open type:

• In open or non-load carrying type, loads on vehicle are transferred to suspension system entirely by separate chassis.
• The body work is either made of very flexible material or made stiff. The body is isolated from the chassis deflection rubber mountings.
• The vehicle loads get concentrated round the mounting and hence result in early failures. Hence this type of construction has become obsolete in case of cars.
• Application: In trucks, the wooden load carrying bodies are rigidly attached to chassis frame and stiff cabs are mounted on flexible cabin mounts.

Semi integral type:

• In the semi integral type, the body mounts are made of stiff material.
• The body structure has now become semi integral.
• This prevents squeaking due to the relative displacement between the body and the chassis.
• Therefore, some of the load transferred to the body structure.
• The semi integral type permits case of styling changes and eliminate road noise when proper insulation are used.

Integral type:

• In the integral or fully integral body shell, the longitudinal and cross members of the chassis were incorporated into the framework of the load carrying body.
• With this arrangement, part of the load previously carried by chassis, is diffused through the body structure.
• This aspect eliminates heavy chassis members that ought to carry the full bending load.
• In the integral construction, the body must be provided with extensions at the front and reinforcements at the rear.
• The latter is required to support the suspension members and bumpers.
• The body must also be reinforced at the other points.
• In spite of all these, the resulting unitary body is found to be lighter.
• Application: Integral body construction is widely used in passenger cars and to a limited extent in bus design.

Open vehicle structure: In the open vehicle structure, the loads on the vehicle are transferred to the suspension system entirely by a separate chassis. In this case, the body work either being made of very flexible material and being made stiff. The body is isolated from the chassis defection rubber mounting. In this case, the vehicle load get concentrated round the mountings & hence results in early failure. This construction has almost disappeared in case of cars. In trucks, the wooden load carrying bodies are rigidly attached to the chassis frame the stiff cabs are mounted on flexible cabin mounts.

Semi integral vehicle structure:
In this structure, the body mounts are made of stiff material. The body structure has now become semi integral.. This prevents squeaking due to the relative displacement between the body & the chassis. Therefore, some of the load transferred to the body structure. The semi integral type permits case of styling changes & eliminates road noise when proper insulations are used. In this structure, extension of body is not possible at front & back. Body of vehicle is heavier integral type structure. Fuel consumptions is more Life of the body structure is short. Styling form of body changes & eliminate road noise by proper insulation.

Integral vehicle structure :
In the structure, the longitudinal & cross members of the chassis were incorporated into the frame work of the load carrying body. With this arrangement part of the load previously carried by the chassis, is diffused through the body structure. This aspect eliminates heavy chasis members that ought to carry the full bending load. In it, the body must be provided with extensions at the front & reinforcement at the rear. The latter is required to support/mount the suspension member & bumpers. The body must also be reinforced at other points. In spite of all these, the resulting unitary body is found to be lighter.

Integral body Construction is widely used in passenger cars & to a limited extent in bus design. Fuel Consumption is less in integral structure life of body is long. Styling of body can not be change & create noise than semi integral structure.