Great set and good scale for all kinds of different truck MOCs you can use this set as a starting point.
Gear box vertically orientation
switch to turn direction of the motor spin direction
- upper hinge crane
- lower hinge crane
- slewing of crane
- out riggers
All powered by one 9V Power Functions XL motor.
The cabin is fairly realistic and hinges over the front revealing the 6 cylinder engine. The downside is missing working doors. There are though very nice MOCs on rebrickable.com.
The 2 pair front wheels are having a rack and pion system.
Wheels and Tires
This set uses eight rubber 62.4 x 20 S tires and standard Light Bluish Gray Wheel 43.2mm D. x 18mm - Flush Axle Stem wheels