My husband and I have been researching RVs for a couple of years now, planning for what was - at the time we started looking - impending retirement. We are now retired (a month in) and are still uncertain between a B, B+, travel trailer, A class ..... or a Toyota Highland Hybrid and hotels (with a tent in the back for times we need it.
After test driving a couple of A-class at the Tampa RV Show a few weeks ago, we felt like those would be absurd for road-tripping. We really liked the new Leisure Travel Van Wonder FTB (B+) on the Ford Transit chassis (diesel). We have read many concerns about the Mercedes Sprinters (problems due to the DEF and EPA requirements), and recently read that Mercedes was going to stop selling diesels in the U.S. due to the issues. At the conclusion of several days at the Tampa show, we thought we had decided to do the car / hotel thing, but we do want to be able to make our own food, and also be able to enjoy the middle of Yosemite or Yellowstone or hundreds of other places without having to book a $500 basic hotel room a year in advance, and it's nice when traveling to have use of a toilet if desperately needed on the road. So we took another look earlier this week at a few rigs and really like one of the B's.
Our initial concern about a B rather than B+ has been the claustrophobic feeling with the center bathrooms and narrow aisle back to the seating / bed area. But earlier this week we spent some time in a Winnebago Travato 59K (21' B Class) on the Ram ProMaster chassis (gas) and really liked it. It is very open in the front with windows all the way around, and the wet bath is across the back. The driver and passenger seats swivel with options for folding out small tables. It has twin beds in the center that can be filled in with cushions, if desired, to a double/queen. My husband is 6'1" tall and most of the B's have beds that are too short, some only 74-76" whereas the Travato has one side that is 80" long. We think this could be a great one for road tripping because we will neither have to tow a car, nor get a big truck or SUV to tow a trailer. Can get in anywhere - including hotel parking lots when desired.
The major drawback is lack of four-wheel drive and low clearance. The ProMaster is front wheel drive and is, in reality, a Fiat Ducato which is the most used chassis in Europe for camper vans.
Good luck with your search and hope to read more about others' decisions and experiences as we go through much of the same thought processes.