d If the frame is bent when viewed horizontally, or when it is difficult to
match the shape of the side rail with a wooden sub-frame, recess
around 1.97 in (50 mm) in front of the bent portion (the end of the
corner).
3) OTHER PRECAUTIONS
a When the surface on which the sub-frame is to be mounted is not
level, add spacers or the like to create a properly level surface.
b When using a bracket or other lightweight steel object as the sub-
frame, leave the ends open - do not weld a closing plate.
c For the vertical sub-frame of vehicles with long baggage carriers, use
steel sub-frames to avoid obstructing side gate opening, closing and
restrict frame flexing.
C14