A support assembly and a method of assembling the support assembly that includes a structural member that is delimited by a first end and a second end with a first end cap configured to be arranged within the first end of the structural member and a second end configured to be arranged within the second end of the structural member to mount the structural member to a structure. The support assembly allows for forces to be applied in all directions without causing rotation or disengagement of the support assembly from a mounting structure.