Hydraulic Jack for Horse Trailers by Equalizer AJ 70 model with 7,500 lb capacityThis system has a lifting capacity of 7500 Lbs. The jack assemblies are manufactured with a 3 1 2" x 3 1 2" outer tube and are available in 24" stroke length. The pump is attached to the jack and has a steel cover included. These should be used on trailers that have a 11' short wall or smaller. This unit replaces existing jack on your trailer and does require a 12 volt battery source to operate. This oversized item will require a $125 surcharge if