I have a 2011 3455sa. Bought used with its original Mor Ryde pin box. Not sure of the part #s but it is the extended (long) version. With my dually long bed, I have no issues hitching up. In fact I can walk from side to side while hitched with the tail gate down. Never had an issue with the pin box hitting the truck sides. I can open the front compartment doors fully while hitched with the tail gate closed. I can even hitch up at a pretty good angle without the tail gate hitting the camper.
Hope this helps.
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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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