What a waste of money to develop and manufacture molds for two special parts only to be used in 1 set. I say this because this truck could have been made from the few parts available in 1970.

Cab/Truck/Tractor (according to the place of living)

Very basic. Which here means boring. The whole vehicle is 3 yellow bricks and 4 plates. At least one gas tank imitation could have been made between the two wheels, say from a 2x4 gray plate. However, the positive thing is that the rear wheel has double tyres. The entire vehicle is built on a 4x8 yellow plate. However, this is not a traditional plate, because at one end there is a larger connector, just like the old 2x3 modified plate to which a helicopter rotor can be attached.

Trailer

This is where things get interesting! Here too, the designers used a special 4x14 plate, which also has a gray stand. In order to be able to connect to the truck, there is a hole at the end of the plate. In addition, there are 2 types of bricks with old-style logos and inscriptions, printed with a thicker surface. The wheels also have double tyres.

Overall

The money that Lego spent on the development of these 2 special plates, I would have rather put more traditional basic pieces in the set, which would have made it more detailed, because even though the development was expensive, the end result is quite boring. Or it would have been simpler to design for a plate-thick turntable, and it would have been possible to connect the vehicle.

However, from a collector's point of view, it is valuable precisely because of the 2 special shape parts.

Otherwise, it is an ideal decoration for a bookshelf. Or if you work for an evil oil company as a manager, I would put it on the desk as a decoration next to the golden fountain pens.

My mod - The same vehicle, without special plates.

I used a 1x1 round brick, which I placed between the studs, as the fixing shaft or 5th wheel. (in the regular 4x8 plate) Anyway, it's still pretty strong, especially with the old "solid stud" round brick.

I also placed a 1x2 tile in front of the round brick for unhindered rotation.

I fixed the stand on the trailer with a basic 2x4 red hinged plate, which I placed under the 4x12 red basic plate.

Tested! It slides a little to the right and left with a semi-brick movement, but it's not disturbing at all.

If the hinge is worn enough, you can prop it up with a brick, otherwise it will stand on its own.

Since the appearance of the cab was rather boring, I also made a "cab over" type of "International" brand out of it. Which spread in the late 1960s and early 1970s.