A red truck to show you how to fit 2 minifigs in a vehicle 6 studs wide and also have opening doors. It also illustrates a good way to make wheel wells.
About this creation
Wheel well parts are shown in different colors so you can see the individual parts. check out how the headlight is attached to that brick.
Put those plates with offset dots as shown along with a 1x1 tile as shown to put the seats on. you also need to put a door or similar structure behind the seat to compensate for the seat back. if you don't use seats, don't worry about that part.