Do not exceed individual lift arm capa. 10,000lb capa/4 arms = 2,500lbs each arm. Example: 9,000lb vehicle with 6,000lb rear axle and 3,000lb front axle. If your rear axle weight is 6,000lbs, then each swing arm needs a minimum arm capa of 3,000lbs. 3,000lb X 4 swing arms= 12,000lb capa.