We have the Cabella's version of the big Clam (The Pavilion) and it is VERY BIG. In our Grand Cherokee it goes from the tailgate to just over the center console between the front seats.
It's too big for the trailer hatch. Even if the hatch opening were big enough it would be a struggle getting it in and out. It's even a little difficult to get in the door.
It fits on the queen bed in the 19 but you have to put one end in first and angle the other up towards the ceiling to get it in.
It will go on the floor too but it's not convenient to get around.
All that said it is nice and sets up fairly easily. It's large size is nice when set up, it even fits around the huge picnic tables our state parks tend to have in Wisconsin. Just make sure to stake out the lines at the center of each panel if it gets windy and rainy or it will come down (ask me how I know).