I may have the model names mixed up but I think you're talking about the Loadwarrior. The Megawarrior has the 18" extension added to the Loadwarrior. The Loadwarrior has 11 crossmembers and the Megawarrior has 15. The extended basket cannot be mounted with the rear crossbar in the rearmost position as the mounts don't line up. I speak with authority as I made that mistake already.