The National model 8100D mounted on the Cat 574 Forwarder offers a 100-ft. (30.5 m) main boom and a two-person man basket. It also features a patent-pending internal anti-two-block design which routes the wire inside the boom to avoid snagging. Additionally the crane was designed with 48 in. (122 cm) outrigger jacks capable of leveling the crane in adverse conditions. The Cat 574 carrier is capable of traveling in any terrain and leaves minimal impact on the environment. The CAT 574 Forwarder eliminates the need for extensive matting typically required to access these areas.