I think I might have powderpost beetles in my RV. How would I treat my RV and do these things bite humans.

First, the easy question to answer: I'm not aware of anyone getting bit by a powderpost beetle. Now could it happen? Most definitely. Adults have chewing mouth parts used to bore their way out of the host wood where they live. These same mouth parts could no doubt impart a bite upon most anything including a human. But there is nothing they want (normally) on a human so I don't think this is anything to be concerned about nor have I heard of it ever happening. But based on their physical design, they could.

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