Vehicle equipped with retractable relief support wheels

A vehicle comprising a chassis on which are mounted the left and right main wheels of at least one set of main wheels, and comprising also at least one set of left and right relief wheels mounted on supports, said supports being mounted on the chassis and provided with means to adjust their position with respect to said chassis, and being adapted to occupy the two following positions:

• a first position in which the left and right relief wheels are placed next to and beyond the median longitudinal plane of the chassis, said left and right main wheels being respectively placed in rolling configuration on the ground, the supports being also immobilized with respect to the chassis, and,
• a second position in which the said supports and the said relief wheels mounted therein, are substantially within the maximum gauge of the chassis resting on the ground solely by its main wheels, wherein the main wheels of said set of main wheels are connected to the chassis via a soft suspension, whereas the relief wheels of said sets of left and right relief wheels are only connected to their respective supports via rigid elements.