Lift Capacity and Lift Height You will need to know the maximum weight and dimensions of the loads you will be handling as well as the maximum fork height needed to stack or rack the loads in order to determine the capacity of the vehicle needed. The lift capacity of a truck is affected by lift height and load size. A larger size load moves the center of gravity of the vehicle/load combination reducing the lift capacity as does the height the load is being lifted. Attachments also affect the capacity of a truck. Copyright 2011 Lift North America Call Toll Free - 1 888 305-3331