Well, here's what I think...
I am no taxonomist, nor did I sleep in a Holiday Inn Express last night, but I will give it a shot...
I do not know a Class A from a Class B from a Class C, but I have been walking around for years thinking they are species of the genus interchangeably known as "Coaches" or "Motorhomes."
My travel trailer is neither a coach nor a motorhome, but is instead a species of the genus known as "Towables," which I understand to include all things towed in which one might sleep (including other species such as 5th wheels, travel trailers, hybrids, popups).
There is another genus which includes species such as "Truck Campers" and for ease of reference here, species such as "Car Campers" (those cars with tents which pop out of or attach to the hatchback of an automobile, the names of which I do not know).
All of the foregoing (Coaches/Motorhomes, Towables, Truck Campers, Car Campers, and all other variants on the personal-vehicle-turned-camper) are members of the common family known as "Recreational Vehicles."
While those with coaches do not always claim their lesser cousins, just as Homo sapiens attempt to exclude Neanderthals (and dare I say I have always suspected there may be a reciprocal sentiment), I still say we are members of the same family nonetheless.
Maybe I am all wet, but that's my working classification of such things.
2013 Windjammer 3008W
2006 Chevy Silverado 2500HD 6.0L w/Equalizer 4
Nights camped: 2012 (29); 2013 (26); 2014 (40); 2015 (43); 2016 (35)