The all new SLX-XD eXtreme Duty™ Dolly from In The Ditch™ has all of the great features of our all new XL Dolly, but with Through Spindle Lubrication rather than our Automotive Style Sealed Hub and Bearings. This option uses traditional style wheel bearings that can be greased by packing or by using our Speed® Lube™ Through Spindle Greasing System. Servicing your Speed® Dolly has never been easier. Our Speed® Lube™ Spindle allows grease to be pumped into the center of the spindle with a standard grease gun. It forces new grease into the spindle and bearings pushing the old grease out through the dust cap opening. This completely repacks the bearing with new clean grease without the mess. When it comes to High Capacity, the XD portion of the name says it’s an eXtreme Duty™ Dolly that is designed to be used in the most extreme conditions. With a 4,000lb Load Rating, this is a real Work Horse of a Self-Loading Dolly.