You can help narrow down the choices you have by knowing the type of truck you are working with or by application.
By Type of Truck
Pick up Truck - go to PTN series liftgate
Dump Truck Applications - DT series liftgate
Straight Truck, Van Body, Flatbeds - DL,DA,HD,DS series liftgates
Trailers - HD,DV,DA series liftgates