Did you know that you can "measure" any space in the trailer from the online web page?
Go to the floor plan page for your trailer. For you:
https://www.keystonerv.com/product/f...floorplans/430
Scroll down to the "explore 3D space" and click on the arrow in the middle of the screen. After the new window opens you will be able to "walk" thru the trailer by clicking and dragging your mouse. In the lower left corner there are 3 symbols. One is a ruler. Click on it and you will be able to measure any space you like.
What I got for the door in question is 30" (I measured the threshold plate) Not guaranteed to be accurate but probably within an inch or two. A bigger problem may be the door into the rear bath from the garage. I measured a mere 21".
Good luck.
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GMC Sierra 2500HD Duramax
2022 Cougar Half Ton 24RDS
Solarflex 400i + 150w suitcase; 206ah LiFePO4; ready for boondocking