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While I can not speak for you 2015 unit, my all hydraulic 4 slide 2011 3455sa does not have any rollers that I am aware of. I believe they are all wear bars of some sort.
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2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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