A solar panel support sub-assembly includes a bottom rail, a first top rail and a second top rail, each rail having first and second longitudinally opposite ends. The first end of the bottom rail is pivotally coupled to the first end of the first top rail and the second end of the bottom rail is pivotally coupled to the first end of the second top rail. The sub-assembly also includes a ballast rail having a first end that is pivotally coupled to the bottom rail at a first location intermediate the first and second longitudinally opposite ends of the bottom rail. The sub-assembly may be unfolded for assembly by pivoting the first and second top rails within a first plane and pivoting the ballast rail within a second plane that is normal to the first plane.