Best you can do is pull in your slides and measure. We have a sleep number that was originally in our 2010 Monty 2955RL and it measures 72 wide by 80 long and has the curved bottom corners. We needed the curved corners because the vanity was in the corner of the bedroom on that model.
The mattress is now in it's third unit and while it does fit, with the slides in it pushed up against the dresser so I wouldn't want anything longer.
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Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
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