Loyd is only part right. the tt is moving in two planes both horizontal and vertical. Consider two vectors forming a 90 dgree angle. the resulting vector is 45 dgrees causing the rack to lean. In the case of foot falls as your weight is applied to the floor it sags toward the middle because it is anchored in both the vertcial and horizontal plane. anchoring it to the wall would only eliminate horizontal motion. Unless of course you have created what is essetially a wall mount by making a wall anchor strong enough to restrict the motion in both planes.
No engineers were killed in making this explanation.
No engineers were killed in making this explanation.