This is the only downside about a class "B" RV -- the slide/slam sound of the main entrance door. Most other rigs, I can hold the handle partway open so there is no noise opening/closing it.
As for alarms, the one nice thing about Ford factory installed alarms... no beeps unless you press the lock button on the remote while the vehicle it is locked, then it will honk the horn once. I usually lock my vehicle by hitting the "7/8" and "9/0" buttons on the door keypad. No noise except the moving of the door lock actuator mechanisms.