The installation instructions as included in the consumer manual(s) provided by the manufacturer of the manufactured home shall be used to determine permissible points of support for vertical loads and points of attachment for anchorage systems used to resist horizontal and uplift forces. Where manufactured homes are relocated, and the installation instructions are not available, such points of support and attachment shall be determined in accordance with applicable provisions of the NCSBCS/ANSI A225.1 standards or by a registered design professional.