Did you know that Mack Truck at one time built trailers? I didn't until last week when, along with other truck writers, I toured the Mack Museum in its recently established Customer Center in Allentown, Pa
'Monocoque' lightweight flatbed will carry more, maybe more safely
"Monocoque" is a French word that usually describes the construction of an airliner's fuselage (also a French word), whose outer skin adds strength to the inner frame. Remove some of the aluminum panels and the fuselage loses both aerodynamics and strength, and would probably collapse if stressed