I've got E-track in the floor of my trailer. The clips are rated heavy, as well as my straps. I've found if you don't put the e-clip in a certain position[in the track], they bend or worse yet, will come out of the floor. I hook the body from loops welded to the rear frame rails.[top of picture] I also have a ring welded to the k-frame. I don't personally recommend the e-clip system, as I've had 2 cars come loose while transporting. My next trailer will be back to d-rings. My shocks are upside down also.[TOP SECRET!!]Crossing the straps seems to be the problem with e-clips. It puts an angled load on them, causing the problems described above.The adjustability for position is great,but I believe it's just to many movable parts.