A trailer (10) body (12) structure defined by dished heads and a rear body sheet metal (13) which surrounds said dished heads and a front conical section (124) with the middle conical body (14) sheet metal, characterized in comprising said front cone section (124) comprises at least one inclined welding line (B) configured in a manner to provide incline in the middle conical body (14) sheet metal in order to combine the rear body sheet metal (13) and middle conical body (14) sheet metal.
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