I saw on the walker site that you can get an accessory that would split the rear casters to follow directly behind the drive tires. Sounds complicated, take a look....http://www.walkermowers.com/options-di.html Does anyone use this? I like the idea that it gets rid of the center track, but It says that it may be less menuverable close to houses etc. If anyone has any experience with this please let me know. Thanks!