A reinforcement system for a vehicle comprising side walls and a floor extending therebetween and meeting with each side wall along an intersection line dividing the side wall into an upper and a lower side wall section. The vehicle further comprises a belly attached to the lower side wall section at a location thereof spaced from the intersection line. The reinforcement system comprises a central reinforcement assembly configured for reducing deformation of the floor due to torque generated along the longitudinal direction of the vehicle. The reinforcement system further comprises a peripheral reinforcement assembly configured for localizing bending of the side wall at the lower side wall portion due to movement of the belly towards the floor.