When sourcing a fork positioner, you must prioritize load capacity, which should match or exceed the forklift's rated capacity. Key technical factors include the opening range (minimum and maximum spread) to ensure compatibility with various pallet sizes, and the mounting class (ITA Class II, III, or IV) to ensure it fits the forklift carriage. Additionally, look for high-visibility designs that allow the operator to see the fork tips clearly, and integral vs. hang-on types—integral units offer better residual capacity while hang-on units provide easier installation.