I plan to make a copy model of a trucked dumper Terramac RT6 full controled with Control+, I'l use this gearbox for my moc. On this photo included straight driving Collors: Yellow - work of gearbox; Green - switch of gearbox; Blue - dumping; Red - left track; Magenta - right track; In the photo below, the rotation mode is enabled l I  also use these small and simple rollers Now moc in this state Photo of original vehicle: