A road vehicle provided with: - a battery module (2, 3, 4, 5, 6, 7); - a chassis comprising a first elongate chassis beam and a second elongate chassis beam, both extending along a length of the road vehicle, each first and second elongate chassis beam (9, 10) comprising an upper surface (9A, 10A) and a lower surface(9B, 10B), an inner surface (9C, 10C) and an outer surface (9D, 10D), the inner surfaces (9C, 10C) of the first and second chassis beams (9, 10) facing each other, the outer surfaces (9D, 10D) of the first and second elongate chassis beams (9, 10) facing away from each other; a battery module mounting system for mounting the battery module (2, 3, 4, 5, 6, 7) to the chassis; characterized in that the battery mounting system comprises at least two battery mounting units each comprising: - a U-shaped top plate (12, 13, 14) having a base portion (12A, 13A, 14A) and arm portions (12B, 12C; 13B, 13C; 14B, 14C), each of the arm portions (12B, 12C; 13B, 13C; 14B, 14C) being connected to a respective one of the outer surfaces (9D, 10D) of the first and second chassis beams (9, 10), the base portion (12A, 13A, 14A) horizontally extending over the upper surfaces (9A, 10A) of the first and second elongate chassis beams (9, 10); - a battery module carrier beam (15, 16, 17) extending below and transverse to the first or second elongate chassis beam (9, 10), the battery module carrier beam (15, 16, 17) having free ends (15A, 15B; 16A, 16B; 17A, 17B) positioned outwardly at a distance from the outer surface (9D, 10D) of the first and second elongate chassis beams (9, 10); and - attachment brackets attaching the battery module carrier beam (15, 16, 17) to the arm portions (12B, 12C; 13B, 13C; 14B, 14C) of the respective U-shaped top plate (12, 13, 14), wherein the battery module carrier beams (15, 16, 17) of two adjacent battery mounting units are spaced from each other for receiving a respective battery module (2, 3, 4, 5, 6, 7). - a battery module (2, 3, 4, 5, 6, 7); - a chassis comprising a first elongate chassis beam and a second elongate chassis beam, both extending along a length of the road vehicle, each first and second elongate chassis beam (9, 10) comprising an upper surface (9A, 10A) and a lower surface(9B, 10B), an inner surface (9C, 10C) and an outer surface (9D, 10D), the inner surfaces (9C, 10C) of the first and second chassis beams (9, 10) facing each other, the outer surfaces (9D, 10D) of the first and second elongate chassis beams (9, 10) facing away from each other; a battery module mounting system for mounting the battery module (2, 3, 4, 5, 6, 7) to the chassis; characterized in that the battery mounting system comprises at least two battery mounting units each comprising: - a U-shaped top plate (12, 13, 14) having a base portion (12A, 13A, 14A) and arm portions (12B, 12C; 13B, 13C; 14B, 14C), each of the arm portions (12B, 12C; 13B, 13C; 14B, 14C) being connected to a respective one of the outer surfaces (9D, 10D) of the first and second chassis beams (9, 10), the base portion (12A, 13A, 14A) horizontally extending over the upper surfaces (9A, 10A) of the first and second elongate chassis beams (9, 10); - a battery module carrier beam (15, 16, 17) extending below and transverse to the first or second elongate chassis beam (9, 10), the battery module carrier beam (15, 16, 17) having free ends (15A, 15B; 16A, 16B; 17A, 17B) positioned outwardly at a distance from the outer surface (9D, 10D) of the first and second elongate chassis beams (9, 10); and - attachment brackets attaching the battery module carrier beam (15, 16, 17) to the arm portions (12B, 12C; 13B, 13C; 14B, 14C) of the respective U-shaped top plate (12, 13, 14), - a U-shaped top plate (12, 13, 14) having a base portion (12A, 13A, 14A) and arm portions (12B, 12C; 13B, 13C; 14B, 14C), each of the arm portions (12B, 12C; 13B, 13C; 14B, 14C) being connected to a respective one of the outer surfaces (9D, 10D) of the first and second chassis beams (9, 10), the base portion (12A, 13A, 14A) horizontally extending over the upper surfaces (9A, 10A) of the first and second elongate chassis beams (9, 10); - a battery module carrier beam (15, 16, 17) extending below and transverse to the first or second elongate chassis beam (9, 10), the battery module carrier beam (15, 16, 17) having free ends (15A, 15B; 16A, 16B; 17A, 17B) positioned outwardly at a distance from the outer surface (9D, 10D) of the first and second elongate chassis beams (9, 10); and - attachment brackets attaching the battery module carrier beam (15, 16, 17) to the arm portions (12B, 12C; 13B, 13C; 14B, 14C) of the respective U-shaped top plate (12, 13, 14), wherein the battery module carrier beams (15, 16, 17) of two adjacent battery mounting units are spaced from each other for receiving a respective battery module (2, 3, 4, 5, 6, 7).