A Class B is a van conversion using the body and frame of the existing van, sometimes cutting the top to increase interior height. A class C uses the front end of a van or truck and is mounted on a longer frame. Then the body shell is built around it. Some manufactures use the term B+ but these are really smaller Class C's. Think of it as a Class B built from the outside in and a Class C built from the inside out. Some people wonder why Class B's cost so much. The answer is the amount of labor needed to gut the van, rework the floor and install all the cabinets in a small confined area. Most Class B manufactures use real wood cabinets with quality workmanship techniques. The same can't be said for many Class B manufactures. I own a Roadtrek RS Adventurous which is on the Sprinter van chassis I average between 20-23 mpg. On my last MH a 26 foot Class A gasser I averaged between 9-12 mpg. Now that diesel is less per gallon than gas it was a no brainer to make the switch, plus we can park it anywhere and don't need a toad. Another thing, check the resale value of a Class B compared to other classes of RV's.
