note that the protective lid in the front of the figure is not shown the hydraulic module 30 comprises also fastening means not shown in the figure in order to mount it directly under the floor of the vehicle fig3 shows the rear part of the vehicle comprising a substantially flat floor 50 which terminates in a rear vertical edge 52 separating it from a second upper part 54 at greater height a fuel tank 56 fills the space below the upper part of the floor 54 and lies longitudinally between the vertical edge 52 and the crossbeam 58 of the rear axle supporting the rear wheels 62 the rear axle called an u201c h u201d axle comprises the crossbeam 58 with each of its ends rigidly mounted to the central part of a longitudinal suspension arm 60 the front part of these arms is connected by means of joint to the body of the vehicle while the rear extremity is supporting a wheel 62 this type of rear axle is easy to fabricate and frees up substantial space behind the crossbeam 58 between the suspension arms the fuel tank 56 and the rear axle are similar to those of conventional vehicles equipped with a combustion engine only the body of the vehicle comprises two longitudinal side members 64 installed on both sides under the trunk above the suspension arms 60 a crossmember 66 mounted to the rear end of the side members 64 supporting the not shown rear bumper is offset towards the rear relative to the body of the vehicle in order to create free space for deformation in case of a rear end collision the hydraulic module 30 is mounted flat under the trunk of the vehicle by.