When installers are presented with large rooms to power stretch, one pesky problem, other than the hard work required, keeps rearing its ugly head: The poles of the stretcher tend to bend or sway from the pressure of the stretch.
Installers have tried a variety of solutions over the years, including bracing kickers on each side, using helpers to support the poles, and attaching brackets with teeth to the poles that hook the carpet. Each approach has its supporters and detractors.
An easy solution to the problem that installers may want to consider is to slide the stretcher poles through the cardboard tube that the carpet is rolled on. This stops the stretcher pole sway, and will not impede the movement of the stretcher, as it will roll when the poles are moved.