Modular trailer with expendable chassis

4) Device according to any of the claims above characterized by its front cross member (and associated extensions) and the cross member (and its associated extensions) receiving the fixing of the coupling tongue are larger than those backward and inward and their extensions.

5) Device according to any of the claims above, characterized in that between the folded position and maximum stretched position, one or more intermediate positions of the frame are possible.

6) Device according to any of the claim above characterized in that some bolts with nuts in sufficient number, passing through the chassis and extension, maintain the chosen length and width.

7) Device according to any of the claims above, characterized in that the axle is made of a cylindrical tube cut through the middle, each of these two parts are nested through a tube that has a smaller diameter to allow to slide in it;

• bolts with nuts holding the chosen gap.

8) Device according to any of the claims above characterized by the doubling of floor space due to the juxtaposition of two plates of identical dimensions, each having an area for covering the frame and forms the bottom of the box when the trailer is in the folded position;

• the length in the folded position becomes the width in the extended position and length in the extended position consisting of the sum of the widths of sheets disposed one beside the other.

9) Device according to any of the claims above characterized by a boom coupling triangle whose apex angle does not vary because of variation in the length of the coupling triangle by adding an extension to it threads on each side of longitudinal, and lateral displacement of the two attachment points of the coupling triangle on the cross on which it is fixed.

11) Device according to any of the claims above characterized in that the sidewalls of the trailer constituting the width of the body (front and rear) are two overlapping galvanized sheet sections, sliding against each other on more than 2 thirds of their length, surrounded by a metal frame in a “U” cutting in its middle on both lengths, the whole system constituting so the front and rear side walls that are fixed to the frame by means of hinges and surrounded by an “U” tube.

12) Device according to any of the claims above characterized in that the ramp supporting the traffic lights and the registration plate is cut in the middle of its length:

• left half ramp and right half ramp.

13) Device according to any of the claims above characterized in that the sidewalls of the trailer (racks) constituting the length of the body are galvanized sheet sections, surrounded on the top and sides of a metal frame that consists of a “U” tube that nests on the front and rear ends of the chassis in the square holes provided for this purpose.