Gotta say that I thought I knew what you were saying, and I agreed the first time around, until I re-read it.
I thought you were saying, or intended to say, that the tension was adding to the bending load on the trailer bed. The reason I was thinking that is because I have seen that happen when I strapped down a utility tractor on my lowboy double-axle bumper pull. After tightening the chains, connected to the sides, I looked underneath to see the angle irons over the axle with a very visible bend in them.