Determination of LUD opening. Study and review of the LUD door at 84 inches does not provide best crate or bulk cargo. Thou it does increase cargo or crate size from the 77 inch opening it does not provide best opening. Reviewing crate dimension chart and screen views provided, it is not efficient for cargo operations, it increases modification cost from the 77 inch opening first reviewed with little gain. For operators with a 77 inch LUD door can benefit from lower cargo modification costs and given cargo operation size.