My 2003 2720 would do it once in awhile. The plastic latch would rotate while I was traveling, and open when stopping. I assume as the door would fibrate up and down it would rotate the latch. I got in the habit of tightening the plastic turn latch when ever it turned easily. I keep it so tight so it was hard to turn. After keeping it tight I never had an issue.
Trailmanor made a modification to correct it somewhere between 2003 and 2009. I found on my 2009 3023 that on door trim where the plastic latch rotates over to latch for travel, they made a modification. TM had put a small lumps about the size of a 1/2 BB on each side where the latch over laps the door about 1/8 of an inch away from he latch. It looks like the lump has a shaft that go's through the trim through a 1/16" hole. I'm missing one, but it looks like it plastic.
See attached photos
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Art & Joyce
Current camper: Motor Home
Previous: 2009, 3023-QB and 2003 2720
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