- (a) The frame or equivalent shall be of such design and strength characteristics as to correspond at least to standard practice for trucks of the same general load characteristics.
- (b) Any primary (chassis manufacturer) or secondary manufacturer (body manufacturers) that modifies the original chassis frame shall guarantee the performance of workmanship and materials resulting from such modifications.
(c)
- (1) Any frame modification shall not be for the purpose of extending the wheelbase.
- (2) Extensions of frame length are permissible only when such alterations are behind the rear hanger of the rear spring.
- (d) Holes in the top or bottom flanges or side units of the frame, and welding to the frame, shall not be permitted except as provided or accepted by the chassis manufacturers.