Well, to be honest there is no formal class B forum. One would still have the same systems as other classes, just in a smaller package. You have your chore cut out for yourself. How are you going to cool the coach? The air conditioner will not be easy to hide from the outside view of the coach. You might want to give us some of your ideas as to what you would like to do with the unit and the amenities you want. What year, make and model of van are you going to use?
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7