While I can see a value of this system in a shop for accident work as a regular use item for travelers I am not sure of the need. It seems they speak of the twist due to what is loaded on.
I use a manual system in that I look out the rear view mirror and if the RV is not square with the back window of my truck I know I need to move something as the weight is not distributed correctly.
Please feel free to use this method and send me $.05 every time you look out your rear view mirror.