not true.. takata actually recomends that setup as do many...mounted to the rear seat OR the floor with mounting plates is about the same length of belt.. the main concern is the angle..u know oc ur not suppose to mount the belts to the rear seat location like that because there is too much belt length and in an accident it would stretch too far. and when i said harness bar i was referring to one of those bars that comes just to mouth the harness to w/o a roll bar.