I was told by Thor they re engineered all full wall slides for model year 2015 to have two rails at the top and additional rollers on the bottom. I inquired because I was concerned about the weight of the full wall slide. So far I haven't had any issues.
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2015 Chateau 31W
2014 Honda CRV EXL w/ Nav
Blue Ox Aladdin tow bar
RVI Brake2
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