kooi-reachforks extend hydraulically. they can be used on virtually any type of lift truck and can solve a variety of materials handling challenges. some of the most common uses include loading and unloading trailers or r......kooi-reachforks extend hydraulically. they can be used on virtually any type of lift truck and can solve a variety of materials handling challenges. some of the most common uses include loading and unloading trailers or rail cars from one side, double-deep storage with conventional lift trucks and dual load handling without loose fork extensions. ks extend hydraulically. they can be used on virtually any type of lift truck and can solve a variety of materials handling challenges. some of the most common uses include loading and unloading trailers or rail cars from one side, double-deep storage with conventional lift trucks and dual load handling without loose fork extensions.