Here are a few definitions I found.
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Class A: class of motorhome referring to motorhome (box) built on chassis frame up.
Class B: class of motorhome referring to conversion vans.
Class C: class of motorhome referring to RV built using van-type chassis and cab.
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Class A Motorhome
The largest of the motorized RVs, is a luxury motorhome unit entirely constructed on a bare, specially designed motor vehicle chassis.
Class B Camper Van
The Class B Motorhome is generally referred to as a Camper Van. This unit is built using a conventional van to which a raised roof is added.
Class C Motorhome
Sometimes referred to as a mini-motorhome, a unit built on an automotive manufactured chassis with an attached van cab section.
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I consider these to be motorhome conversions, an all new class. There is no way these fit into the traditional classes they have. They are not built like them, they don't drive like them and they definetly don't look like them.
Travel Supreme makes a garage mid engine pusher, which if you really squeeze it in can fit a Mini Cooper. I think the garage is 12'. It is not full height like a garage conversion.
Bill
2003 28' Show Hauler Motorhome on a 1995 FLD 120
www.showhauler.com