I just received my first bpw, a Tecline donut 17. It arrived with the harness pre-threaded but the tank straps were not attached. There is also a single-tank adaptor attached with velcro straps through the backplate. I am a bit confused about the optimal way to attach the tank straps. 2 velcro straps are holding the backplate to the wing. Should the tank straps go over these and through the tank and wing, or should they be above/below and only thread through the wing? I was surprised not to have the harness go through the wing. Thanks for any advice!