They support the extension on my caravan. My wife and I live in a trailer all the time and spend a lot of time with pull out furniture. I hope these sway bars will extend the life of the sprockets and chains. Simply lay the 2x4 from one to the other and slightly increase the height after touching and before lifting. Don't lift a slide with it. In any case, I recommend this product if you prefer proactive maintenance to a costly repair.
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