Trailer

A trailer comprising:

• a floor having a top surface, a bottom surface, and extending continuously from a front end to a rear end, wherein the top surface is adapted to transport a payload;
• a rear wheel assembly;
• and
• an elongated shell comprising a bottom wall and side walls, wherein the side walls are secured to the bottom surface of the floor and the elongated shell extends behind the rear wheel assembly;
• and
• wherein the floor and the elongated shell define together a single, substantially hollow, internally undivided, and substantially closed torsion-resistant chamber with the bottom surface of the floor defining a top wall of the substantially hollow and closed torsion-resistant chamber, and wherein the substantially closed torsion-resistant chamber is free of lattice framework extending therein and the elongated shell is free of apertures that substantially degrade the resistance of the substantially closed torsion-resistant chamber.