ANTI-TORSION SUPER STRUCTURES
When going over uneven ground, your vehicle's suspension will absorb much of the difference in surface height between the wheels. However, at some point the suspension movement will not be enough to compensate for the height difference. The weight of your vehicle will more likely than not result in some chassis-twist.
Many off-road vehicles are actually designed to allow chassis-twist. The Mercedes-Benz Unimog is a prime example of this. As the vehicle goes over very rough terrain, such that the vehicle's suspension cannot fully compensate, the weight of the vehicle will most likely cause the chassis to twist until one or more wheels make contact with the ground.
Let us consider this chassis twist. Assume vehicle’s living cell is attached directly to the chassis in a rigid fashion - what will happen when chassis twists?
This twist will be transferred directly to living cell.
When driving over corrugations, which we will no doubt encounter in Unpaved roads, this twist can literally tear your living cell apart!
Countering this problem by making body sufficiently strong to withstand this twist is not an ideal solution, as this will have the adverse effect of preventing chassis from twisting sufficiently, thus reducing its off-road ability.
The ideal solution is to have a torsion-free mounting, which uses geometry to counteract the chassis twist.