You'll know it's running, but I don't think the vibration will be much different at the genny vs. near the genny. That said, I don't think too many of us sleep with genny running unless it's a daytime nap while other people are dong other things. Thoughts that come to mind:
1. Unless you add a vent kit, there's risk of carbon monoxide entering the non-moving coach.
2. Many (most, actually) campgrounds have night time quiet hours when you are not allowed to run your genset.
Class C we have uses the ONAN 4KY and that's what I base the above on. Previous coach didn't come with a genny and I added an old ONAN BFA. Both were 4KW and the BFA was a longer-lasting genny, but it was rough and loud in comparison. Like we had a garden tractor in our closet - trying to get out.