Mobile boat crane has different lifting tons to adapt to boats. For example, light duty travel lift Perfect Steerable Transfer Cartludes 25 ton, 35 ton, 40 ton, 50 ton, 60 ton; heavy duty travel lift Perfect Steerable Transfer Cartludes 100 ton marine travel lift, 200 ton, 400 ton, 600 ton, 800 ton, 1000 ton, 1200 ton. Both small.