An adjustable truss structure is provided and includes a truss member, a first channel having a first slot, the first channel being attached to the truss member, a rail having a second slot, and an anchor attached to the rail, the anchor having a member rotatable to a first position where the member is insertable into the first slot and rotatable to a second position to engage with a surface of the first channel, enabling the rail to be selectively moved relative to the first channel and locked into a selected fixed position relative to the first channel. A support member having a second channel with a U-shaped cross-section, the second channel being hooked into the second slot and being slidable in the second slot.