What are Trailers?

Used Trailers, have you listen name the big huge bumpy lumpy which run on roads whose length is as small as the car to the huge building size. What they actually are they are only a metal boxes fitted on long rods of iron and steel which are bent in such way to bear heavy load which uses laws of mechanics. 

On that heavy metal rectangular boxes are placed to which we carry materials from one place to another. Seen movies like twilight in which the character ---take a vehicle type thing and becomes happy at that time I don't know why she is happy to take the ugly red color type truck because young generations are happy to get car if they owned also in movies like transformers in which beautiful trucks of different sizes and shape become auto robots such a beautiful description about machine with man..It’s amazing. 

From these I don't know what are they I think they are merely trucks, but through Internet I had search about them there I know what are they and how they are important. 

So actually trailers are nothing a truck at back a heavy metal box is arranged in such a way so in it we load heavy materials products beverages and many more in order to transport to one place to another. They are very important not only for business, but also for traveling with alone and family in European countries even all people had trailer to do day today life of work. So trailers are not important part of movie, but in everyone's life to get rid of any kind of problem.