Vicki is right, look out the window on the slide. Let's think about this. The person knocking is 4 steps below you. And they are not looking up at the window, they are looking at the door. Even if they do look up at the window, the windows are tinted so you can not see in. Ed and I just tried this and you can not see the person in the 5th wheel so you can do a quick peek without anyone seeing you. Or (to save $200 plus installation) you could yell, "Who's there?"
Happy trails............................
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