This final rule amends the Manufactured Home Model Installation Standards by revising existing requirements for ground anchor installations and establishing standardized test methods to determine ground anchor performance and resistance. The performance of conventional ground anchor assemblies is critical to the overall quality and structural integrity of manufactured housing installations. Because there was no generally accepted method for rating and certifying ground anchors, states had adopted different requirements for certifying ground anchor performance. This final rule establishes a uniform test method that can be utilized to determine and rate ground anchor performance in different soil classifications and may be used by states to certify and accept ground anchor assemblies.