I would have called it a square connector tube until DRV told me what they called it. Same setup in lots of Lippert frames with slides. That sliding tube makes it way easier to adjust the sides when the gear paks get out of sync.
Take care of that oldie but goodie...
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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