Which popular 70s carpet had long fibers and was used to cover everything from floors to van interiors?

The popular 70s carpet you’re referring to is likely "shag carpet." Known for its long, plush fibers, shag carpet was widely used in homes, especially in living rooms and bedrooms, as well as in van interiors, contributing to the cozy and laid-back aesthetic of the era. Its luxurious texture made it a favorite choice for creating a warm and inviting atmosphere.