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I've seen that type of reinforcement on trailing arms before in magazines and here on the board. Frankly, I don't see that helping much of anything. I've had a little formal education in engineering and quite of lot of on the job engineering. When I re-did my trailing arms I cut pieces of 3/16" plate and welded them inside the arm to increase the strength of the "I" part. They (the trailing arms) are in the configuration of an "I" beam and it is the vertical part that gives the top load strength. There isn't really much twisting forces on these arms. The physics forces are compression front to rear from acceleration and down load from the springs.
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