How do people normally secure sub boxes? Or do you just let them slide around in the trunk? I have dual 10inch ported facing the rear of the car. I'm not sure if I like the ported 10s, might switch back to a non ported box or put my single upwards facing12 back in. Anyways, I've just been using a tow strap around the boxes and hooking it into the rear seat frame. There's got to be a better way? Something has to be better looking and more secure.