I periodically hit this bar with spray lube to make it ease the load on the motor when moving the slide over the bar (rub rail). Maybe that will also help minimize cracking too. Do you know if the entire slide contacts this bar, or just he edges? I ask because the bottom of the slide is covered in a thin (cheap) woven plastic material and not a durable solid plastic sheet that I had on a previous RV. I assume you have to fork lift the slide out to R&R the bar. And what is the P/N for the bar? Interested in knowing what it is made of (nylon?).
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Rick with Lori and Two Pekes
'16 Jayco Seneca HJ Topaz
'13 Mini Cooper toad : Blackhawk All-Terrain tether
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