I'm not an engineer, but I think the objective is to put just enough force front and rear to prevent the normal vibration from sliding the TC out the back of the truck.
The Stable Lift sandwiching the truck bed and frame between the TC and lower hoop secures the TC to the truck as good as it gets. Years ago, I was in heavy traffic and had to make an evasive maneuver. The truck and camper were on two wheels. I am amazed I did not go on my side. With conventional tie downs, they would have ripped off and the TC would have flipped out of the bed.
Wayne