No tools required. There is a small lever to press while the seat is pivoted slightly and then sliding the seat backwards. There is a small piece of carpet that unsnaps to get at the lever.
Thanks! I got them out. Just hoping I never have to put them back in! Now I'll have much more space for camping and kayaking gear. Maybe better mileage, too. Also looking at getting slightly more modest tires for the road, without entirely giving up the G-r-r-r-r-r look of my truck. Hoping that might reduce noice and enhance mileage, too.