I want e-track but it's too low on my "priority list" to have bought it yet. So when my trailer isn't totally full, I have to lay some things down to keep them from shifting or falling during transit. Even with two double 18s, four double 15s, two racks, a big trunk, four wedges, and two mic bags, I have all the double 15s laying down right now to keep the objects around them from walking around. I really need to buy covers for them soon because this is where most of my scratches and dings come from.