Use this text to answer questions in as much detail as possible for your customeThank you for the question! The pulling strap is an important element to our system. The pulling strap is designed to significantly reduce drag or rolling friction. The strategically placed D-ring which create a slight upward pulling angle distribute the weight evenly across all the wheels. We have a video called “TACH Pulling Strap! It’s That Easy” if you would like to take a look. In the video, a woman is easily pulling about 300lbs of TACH and pushing a stroller at the entrance of Chicago O’hare airport. Video Link: https://youtu.be/fBLif5VcoWA The strap is usually not necessary with only 3 pieces of luggage, but if you are walking a long distance it rolls easier and allows you to take longer strides to cover more ground quickly. If you are pulling 4 or more connected units you will really start to notice the difference between pulling the raised handle vs using the pulling strap.rs.