Rear wheels are attached on movable arms and connected with stabilizating rod, the same as car wheels. Gear has from production set Ackermans angle, so there is no skewing. Rear wheels carry whole weigh, which normaly need carry up user of Mobarrow. Weigh on front wheel is same as on “one wheel Mobarrow”, so there is good contact drive wheel with ground and user need carry 0% of weigh. Now with mechanical brake for stop and fix Mobarrow on hill or in difficult terrain.
As a new has rear wheels stabilizator for easier drive, wheels are moving forward and reveres better.