Hi, We purchased a new 21RB back in October and it had a short queen mattress (75 inches long) in it from the factory. There was plenty of clearance for the slide but the mattress was so terrible, we did not even sleep on it once. I replaced it before our maiden, week long trip, with a standard, pillow top queen (80 inches long) and yes, it pretty much touches the slide. I just make sure to pull up the bedding and push the mattress forward prior to moving the slide in or out. Most times, I have my wife activate the slide while I monitor the slide/mattress to make sure it does not bind. No issues so far!
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