Two different types of campers for a truck. One that sits on the bed rails and one that doesn't. I'm guessing you have a truck camper that doesn't sit on the bed rails, but sits on the truck floor.
Camper that sits on the rails can be called a topper, cap, canopy, shell, camper shell. Some today have a small cabover. These ones with a small cabover are hard side or pop up/top. This type of camper clamps to the bed rails. This type of camper usually doesn't have jacks to lift it off the truck but there are some/very few on the market that do.
Camper that sits on the floor of the truck and clears the rails is a truck camper. These too can be hard side or pop up/top. These would be easier to take off the truck using jacks. This type of camper uses tie downs to secure it to the truck. These are fully enclosed and heavier than the camper that sits on the rails.