My wife broke her arm a while back and I took her to the doctor a couple of weeks ago. While there I watched the mowing guys doing an excellent job with a couple of Z's and a WB. Very professional, nice work. When loading the trailer they drove the Z's on, then the WB, put up the gate and left. I looked for that prolocker thing there was not one, there were no lock downs or straps on the equiptment. I have watched a couple of other guys since then, they did not appear to strap down their gear either. Is this common practice?