I can't help on your main question, mine doesn't have the slide out rack, but I can speak in favor the the Steadyfast system. I love it and it makes my unit rock solid and appears well designed and built. Can't see how I tolerated the rocking in my last 5er.
Good luck with you decision and I hope you get it installed okay. BTW, I was going to install mine as it seems very straight forward but I wanted it done before we left on a trip so I had it done and it only cost $150, so money well spent to me.
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Paul "Poppy" Cervone
2015 Grand Design Reflection 337RLS
2011 Cougar High Country 299RKS - SOLD
2007 Silverado 2500HD Duramax/Allison CC 4x4
2007 Corvette Z51
2009 Cadillac CTS
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