I started building this US Truck about 6 months ago and it was finished to be shown to the MEI 2020, unfortunately, for reasons of force majeure, the MEI is posponed so here we are.
 
It's not based on a specific model, surely Mack from Cars inspired me a lot, and I took some inspirations by pics on the web.
I chose to build less sophisticated suspensions, pendular on all axles, to allow a more robust frame (due to a very long wheelbase) and a more robust drivline, it doesn't have U-Joints (still some parts could be damnaged).
As almost all my others Moc it's driven by 4 XL PF Motors and steered by a L PF Motors, more precise at low speed.
It has 2 M PF Motors to operate the two speed gearbox and the fifth wheel.
It has openable hood, behind which there is a detailed Inline-six engine with belt driven alternator and clima compressor.
It has openable doors with detailed interiors such amortized seats, bed and various storage compartments.

The truck is powered by 2 Buwizz but it's possible to use 2 Li-Po Battery and 2 SBrick.
 
The trailer is designed to fit a Porsche 911RSR, original set N° 49096.
It has working legs and rear access ramp powered by a Control+ Hub and 2 XL C+ Motors.
I chose to use it because I have one on the shelf and because it's compatible with the BuWizz app, so I can control everything using only a smartphone.
The trailer has detailed interiors, the car compartments and the meeting7telemetry room.
Moreover I built a tool trolley.

Now some numbers:
 
Truck
Length: 79,2 cm 99studs
Width: 24,8cm 31studs
Height: 35,2cm 44studs
Weight: 6 kg

M PF motor: 2
L PF Motor: 1
XL PF Motor: 4
BuWizz: 2 (or 2 LiPo Battery and 2 SBrick)

Trailer
Length: 127,2 cm 159studs
Width: 24,8cm 31studs
Height: 38,4cm 48studs
Weight: 8.4 kg

XL C+ Motor: 
Control+ Hub: 1
 
Truck and Trailer with load:
Totalal lenght: 175,2cm 219studs
Total weight: 15.9 Kg