Not being familiar with the unit and layout, is that side door an emergency exit?? I believe that standards are set up that each sleeping area must have an emergency exit. That might be why you cannot order the unit without it.
Some reports have been made that Keystone is no longer plumbing sinks and such into the black tank. But, that would not stop me from purchasing a unit that works for me, I would just wash hands and such in the kitchen sink. Others here may happen along with other work around ideas.
Welcome to the forum, hopefully you will enjoy your unit.
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