If you've invited a WA villager to live in your town, can you still scan them into your campground? For example, I have Marty in my town, but I'd like to complete the Pompompurin set. Could I still scan Marty into my campground even though he lives in my town?
Im pretty sure you can't, since when you scan them in, Wisp asks what you would like to do, like "Give me something", so I'm pretty sure you wouldnt be able to make him move in again ;w;'' plus it would be strange to have two martys in your town at once...
I mean maybe you can still try ? For the Isabelle amiibo for example follet takes her place in the town hall while she's relaxing in the campsite, so maybe this'll happen too ! But I never tested so I don't know.
You cannot get the RV to show up again while you have that villager living in your town. You can however scan the card, select 'Give me something', and you'll get a random item from that RV. I've done that with Bea a couple times in Hawthorn.