The stickers have been there, it is just the information that is mandated to be included has changed over the years.
For example on my 2002 coach the sticker next to the drivers seat includes VIN, GAWR front / rear , GVWR, tire size, rim size and inflation psi, and unit serial number along with coach builder and chassis builder. Surprisingly no GCWR listed there on my coach, though I also have a paper cargo carrying capacity sheet glued to the wall of the bathroom closet, which includes tank sizes, cargo capacity, and UVW, and GCWR though this was a RVIA industry mandated sheet, not government mandated. (I did not know this off the top of my head, I keep photos of both on my phone)