Support structures for solar tracker systems with increased flexiblity

A solar tracker row, comprising:

• a plurality of A-frame shaped supports coupled to underlying ground, the plurality of A-frame shaped supports arranged in a north-south row, each A-frame shaped support defining a central longitudinal axis;
• a torque tube extending along the north-south row and rotatably supported on the plurality of A-frame shaped supports;
• a plurality of solar module assemblies coupled to the torque tube;
• each A-frame shaped support including at least one tubular, hollow shaft, the hollow shaft having a first section having a first circular cross-section and a second section having a second circular cross-section, the hollow shaft having a third section having an oval cross-section, the oval cross-section defining a major axis and a minor axis, the major axis being oriented in an east-west direction and the minor axis being oriented in the north-south direction, the third section being located between the first section and the second sections, the circular cross-sections and the oval cross-section being taken normal to the central longitudinal axis, the third section providing each A-frame shaped support with greater flexibility in the north-south direction relative to the east-west direction.