Back when FL started using the term XT, their flattop trucks roofs were just barely above the windows. You couldnt stand up to pull in your britches. Then they started making the XT. And like I Glide 47 said, it meant extra tall. And 4 inches higher. Still guys over about 5'10" or so couldnt stand up straight. Mid-roof Cascadias are even a good bit taller than an original XT was. I dont know why they even continue to use the XT name. There isnt a shorter roof available that I am aware of. Except maybe special order for car or boat hauler set ups.