Diving an equipment into parts

Hello,
Our Client has three kinds of vehicles.

1. A whole truck,
2. A truck with two parts:
i) prime mover (The front part), and
ii) a semi-trailer (The Rear part)
3. A truck with three parts:
i) a Prime Mover (The Front Part)
ii) a semi trailer with flat bed for carrying container (The rear part) and
iii) a container.

Now my questions are:
1. How can these three parts of a vehicle recorded separately? If yes then How?
2. If they can be recorded separately, then how can they be grouped to become one vehicle?
3. Can a single part of vehicle, be paired with different parts of vehicles? Like, Container A be paired with Semi-trailer A for Shipment-1 and later on the same Container A be connected to Semi-trailer B for shipment 2? If yes. Then how?

Regards,
Janesh