It's not a matter of placing stress on the bars.
When backing the trailer, especially at a sharp angle it's pretty easy to jackknife the trailer, and when it happens it happens very quickly. If you're backing the trailer at a fairly straight angle, you'll be fine. However if you're in a situation where you're cutting a sharp angle to maneuver into a tight spot it's best to disconnect the bars so the system isn't damaged if the trailer jackknifes.
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