Camper Vans & Class Ber's only. How late is too late?

The reason I ask for Class B, and Camper Vans is because most/many travel differently than other RVers. They tend to be tourers, moving to a new place every day or two, often driving late at night.
This is the Camper Van Conversion (CVC) forum, and those are mainly the people I hoped to hear from. Of course all opinions are welcome, as long as everyone plays nice.
As someone said, size does matter. :)