Stepdeck trailers otherwise known as single drop trailers are specifically used to haul freight that exceeds 8 6 in height that you would normally put on a flatbed trailer.
Step deck trailer width.
Trailer width most open deck trailers are 8 6 102.
The next graphic shows the legal hauling dimensions for a step deck trailer but these can also vary by equipment and by states in which you re hauling.
Any load exceeding this limit is considered oversize and would require state permit.
8 6 maximum load height.
10 6 maximum load payload.
Often the deck width is referred to as a 102 referring to the 102 inches dimension.
This first graphic explains the step deck trailer dimensions.
48 and 53 maximum load width.