Manual Crane Forks are awesome at giving you access to the full range of the fork rating from 0 to 100% of the safe working load. Self leveling forks are unable to safely lift loads that are less that 25% of the rating because the springs need to compress. If you have light loads and 6600 lb loads to lift with a set of crane pallet forks, Then the 1053 it the right model for you.