Travel from Atlanta to South Bend- during football season

There's no such thing as a B+, except in the minds of some RV salespeople that want to try to tell you there is, to get you to buy a small Class/Type C. It's either a B (van body intact conversion - Sprinter, Promaster, Transit, Chevy Express, etc.) or a C (van cab cutaway chassis coach added on top conversion - MB Sprinter 3500 cab chassis, Ford E350/E450/Transit, etc.).

So, do you want a B or a C? You can't go too far wrong with Winnebago, Thor, or Leisure Travel for a B, and the same for a C.