"Should we have a 'Campsite Occupied' sign so our site will be there when we return?"
Great idea--We need to get one of those.
"Will we struggle with storage?"
Yes--that was a trade-off for use--we are cramped some, but is worth the nimbleness"
"How about sleeping in our Roadtrek? Comfortable?" Our fold down king size bed was not very comfortable. We added a foam topper and is now much better.
"Is the shower practical enough to use, or will we likely seek out campground facilities?" Our wet bath is very small, but we use it in a pinch, especially after half marathons, etc. But we use CG facilities about 50% of the time.
"Are we likely to swivel the cockpit seats around, or is that one of those things that's possible, but rarely done?" We rarely spin our captains around. We have the 70X--so we also have 2 captain chairs behind us to use with a custom table top.
Good luck with your Class B!