A trailer pushing the TV is akin to trying to push a string or a chain...it buckles. Using the manual application of trailer brakes only, pulls the string taught. So does acceleration, but if you run out of speed before you run out of hill then the eventual disaster is multiplied big time.
I've noted in previous posts, my 1500
Jimmy and 23' Award were a monster combination. I've had vehicles around me dive for cover when the Award started wagging. Even with the friction sway control up tight if there was any play in the linkages we would be fighting downhills. One day when I had no room to correct, it hit me...Manual trailer brakes!!!!
I never had that problem with my 25s but I am reading shorter trailers are experiencing it. The Hensley or Pro-pride effectively lock the rig into one single inflexible unit when the trailer starts to push. Friction type anti-sway tries to do the same but as I discovered on my Award even 1/16 to 3/32 of play was enough to allow the trailer to take over. Just before the end of a long wearing trip I got out the wrenches and tightened everything up and the whole rig was suddenly docile again!