Why a class A gas over class C?

We use our two front seats as seating while parked after we turn them around. Most C class units the cab area is a separate area and the chairs are forward facing only. Some C’s are different. As other have said, Class A’s typically have larger capacity everything. Larger tanks, larger internal storage, and larger external storage but this is not a universal situation as some A’s have small tanks, and some C’s have larger ones. My opinion is that most C’s are designed for families and A’s are designed for couples who may from time to time take family or friends with them. Again, not universal. We bought a bunk bed model for the option to take grand kids or nephew with us. The rest of the time it’s overflow storage. And while it willl sleep 6 there is really only room for 2 peoples personal stuff.