Trailer beds don't sit level with your dock, they ride higher or lower depending on load weight, trailer type, and how the truck settles against the bumpers. A dock leveler is the permanently installed ramp that bridges that gap, so a forklift crosses smoothly between dock and trailer instead of dropping off an edge or climbing a lip. A dock lift does the same job for facilities without a raised dock at all, mechanically raising and lowering pallets to trailer-bed height.
This is engineered, installed equipment, capacity, pit depth, and mechanism all get specified to your actual dock, your trailer mix, and your cycle count. Nothing here is a stock size you order off a shelf; every leveler and lift on this page starts with a conversation about your dock.