Interesting TC concept

I like the room and aerodynamics of the truck cab .
Like the pic of that tent , there was a brand of tc that had a slide - down . The slide extended down from under the cabover to give extra room . If i find a pic, ill post it . I assume the camper had to be off the truck in order to use it , so it was not too popular.

Ifound the TC i was ref. to :

camper with slide-down ?

Neat...