A tank truck (10) for carrying fuel has a tank (12) whose shell (18) is supported by a baffle (20). The vertical cross section of the baffle is straight, but its horizontal cross section has two concave sections (48 and 50) and a convex section (52). Horizontal ribs (30 and 32) are secured to the face of the baffle (20) and help it to maintain the desired cross-sectional shape.
