As an owner of a B+, I can tell you they are technically a "form" of a C but are different. Do not let people tell you otherwise, it is very important for consumers. They have changed over the yrs with some being longer but technically they were marketed for people that wanted something slightly bigger than a regular B, and a little smaller or more streamline, lower in height with better gas mileage than a C. An easy way to tell the difference between a B+ and C is they do not have the large square overhang cab with the bunk. Nexxus is a great site where you can view the difference between their C and B+ as they clearly marked as such. Coachman makes a Prism 24 ft long 2150 (C) and a Prism 24J (B+) same floor plan. The 24J has no overhead bunk, is lower in height, has slightly less outdoor storage. I do not care for regular C's but really like B's and B's. They also get better gas mileage than regular C. Our B+ on a V10 got 12-13 mpg, a similar C same length would get about 8 mpg. The Leisure Travel Serenity, Unity, can be listed as "C's" but are a B+ form of a C. So is the Winnebago Navion/View without the overhead bunk, You can find some B+'s that are 30 ft long know or they made a few which blurred the lines. Whether people on here who don't own one want to argue that they are C's, I will always fight this bc they are very different than a regular C for the above reason mentioned and that is important to consumers. Other example of a B+ is the Pleasureway Pursuit. Even tho the Pursuit can be bought with a VERY small bunk overhead as an option, it does not have the large square boxy like overhang cab over the front.