Just a guess, but I have read posts about the slide mechanisms attachment to the slide wall becoming unattracted. Lift the bed up and remove the plywood under it to expose the inner workings of the slide system. Look where it attaches to the head of the bed outside wall.
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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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