Amazon.com: ONECHOI Router Sled for Woodworking for Slabs, XYZ Axis Adjustable, Slab Flattening Jig w/Adjustable Knob, Slab Flattening Mil, Levels Wood Slabs Up to 56” Wide, Great for Home Improvement Projects :
Router Sled Table to Flatten Slabs | LumberJocks Woodworking Forum
CGTK - Router Sled
How To Make A Router Sled To Flatten LARGE Slabs! - YouTube