We owned a 190P Roadtrek Class B for years and swapped for a BT Cruiser. We found the BT Cruiser to be much more comfortable for extended camping, of course, but at that time in our lives we were more into touring than camping for more than a couple of days. After a few years, we sold the BT Cruiser and went to a Roadtrek 210P. We toured some, camped for a week at a time in this larger B (compared to a 190). Now, we are back to a small C aka a B+, which is probably comparable to your BT Cruiser. That is because, now fully retired, we may spend a couple of weeks at a single place compared to a couple of days in the earlier years.
As I recall, the BT Cruiser is a full 96 inches wide and ours was about 24 feet long.
We always had to park both the Roadtrek 210 and the BTC and now the Phoenix Cruiser at the edge of the lots. The RT 190 could be parked just about anywhere we wanted to park it.
The summary and the truth: you will give up driveability, flexibility and mileage when you go from a B to a C. What you will get is a dry bath, room to really stand up and comfort that allows a couple of rainy days to seem tolerable compared to being canned in a B. It is all about how you will use the RV and how much comfort compared to convenience and parkability is worth.
