In older rigs the weight specs for the vehicle were usually tucked away somewhere in a cabinet or wherever. My 2014 model (built in early 2013) has a large yellow label on each door, which lists the OCCC among other things. I was under the impression that most if not all newer RVs have that info somewhere more accessible than the older units. I imagine many people buying the newer units don't realize when they're buying, how important those numbers are, or what the numbers actually mean.
I had a 2001 Class C and the specs for that MH were in a closet in the back wall of the unit (OCCC was a little over 1,000#), whereas my newer unit, a foot longer, with the same floor plan has an OCCC of 3,275#.