There are Truck Caps and there are Tonneaus (or tonneau covers
). That is what they say in the Century and Leer catalogs in front of me and the ARE website also calls them the EITHER - CAPS or TONNEAUS. This is what I have heard them called for over 20 years. If you want to call them a camper shell, canopy or topper fine but that is not what the companies that sell them call them.
In New Jersey, when people say CAMPER TOP (or shell) they mean the big camper cap setup on your truck bed that you can stand up in. It usally extends above the roof of the truck and many times a foot or two past the tailgate. Usually a "camper special" F250 (FORD) etc. is what carries these. The reason it is called a camper top is that you camp in it. That is what it is made for.
I did not get into a lot of dialog with the other person before on the public thread, I used the private message feature because It did not sound like he had anything called a cap for sale weather it was a hat, distributor cap or whatever and I did not think a continued dialog on the thread was doing anything but taking up space so I did it by private message.
That being said, I was looking for the thing you put on a truck bed and has windows.