Yup. Often discussed on this forum--do some searches. To get the most leg room you need a seat with a thin back that may be moved as far back (touching the back of the cab) and as high as possible (allowing you to see out of the cab). It's why very little leg room (maybe none) is gained by removing a gas tank mounted behind the seat in a truck cab--you do, however, gain storage space, dismiss safety concerns, etc.
