The Rev is four panels on the version for the HD trucks, and three for the 1/4 ton beds.
The bison was three regardless. Hence why it would cover.
There is a very small part of the panel that doesn't fold at all. It's what keeps the thing secured to the bed rails.
I got lucky that a guy was selling his for $900 and almost new. His truck came with it, and almost always hauled a gooseneck trailer. So he took it off, and had no need for it. Retail is $1400+ here in Canada.
Don't pay the dealer to install. It's super simple and less than a half hour to do yourself.