Lego Technic Volvo Truck with Trailer RC & HOG Fully Suspended + Lifting Axis +Trailer Steering Axis

Instructions: https://rebrickable.com/mocs/MOC-7574...

This is my model of a Volvo truck with trailer. It consists of over 4000 parts.
The model can be put into different operating modes by switching the double gearbox:

1. when the gearbox is in neutral position the model can be moved by hand by installing a hidden axle as a steering access point.
2. when the gearbox is not in neutral position, the model can be moved by remote control. There are 2 speed levels to choose from. Here an M-motor is responsible for steering and an L-motor for driving.

In both modes the steering wheel moves as well as a fake engine part.
The driver's doors can be opened and locked.

To park the trailer, the pillars can be extended via hidden gears. In addition, another hidden gear wheel can be used to raise the first axle of the trailer. The trailer's hatches can be opened to reveal a large loading area.

Another special feature of the trailer is the third axle, which steers automatically when driving forward. Furthermore, this is also automatically locked by an integrated towing mechanism when driving backwards. This is either activated or released by jerking the towing vehicle in the appropriate direction of travel.

The whole MOC is spring loaded. This means that both the front and rear axles of the towing vehicle have a supplied drive axle, both of which contain a suspension mechanism. Furthermore, each of the trailer's three axles is suspended, including the liftable and steerable axle.