I needed to haul some 2x6's the other day and couldn't find a place to attach a tether to the rear hatch door (the boards were 6 and 8 feet long). Is there something I'm missing? I just let the door down and sitting on top of the boards. Of course there was a constant banging sound of the door bouncing on top of the wood. Luckily it was a very short trip. Any ideas?