Most metal moves on a flatbed because it loads from the side or top with a crane or forklift. A step deck adds height for taller bundles and lowers the centre of gravity for heavy coils. A conestoga, a flatbed with a sliding tarp system, protects finished product from weather without the driver tarping by hand, and it costs more for that reason.
Coil equipment is specific. Coil racks or chocks hold each coil in place, and some trailers have a coil well, a recessed section in the deck that cradles the coil and keeps it low. The carrier has to bring this equipment, so it has to be confirmed at booking.
Dunnage, edge protectors and corner guards are not optional extras. Chains and straps cut into soft edges and coated surfaces, and damage from securement is still damage. Receivers notice it, and it ends up as a claim.
Tarps come in weights and drops. Steel tarps are usually smaller with a shorter drop than lumber tarps, sized for low, dense loads. If the receiver specifies a tarp, a smoke tarp on the front or double tarping, we pass it to the carrier word for word.