Same thing happened in my 321RSTS, the fix isn't that hard. First, there is a trim piece across the top of the door opening (mine was inside the bathroom side). Take that off, then roll the door closed so you can see what happened.
In my case, the rear "hanger" screws pulled out of the door. You'll have to take off the hanger pieces (there is a little knob you have to turn to release the hanger from the base, must get that apart to get the base off) so you can rescrew the base back into the top of the door... be sure to move it forward or back so you get an all new bite into the door. Then you can attached the hanger back to the base and good to go...
Almost.... what I did was assume if it happened once (likely due to some bouncing down the road) that it would happen again. I took a cheap pool noodle, cut a piece off about the width of the door, trimmed it length wise until I could shove it under the door to support it so the door can't bounce... I always shove it under before travel and so far, so good.
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2022 Eagle 321RSTS
2020 Sierra 3500 Denali Duramax
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