Why is side loader important in all industrial manufacturers? Side loader forklift trucks are similar to ordinary forklifts, but they carry their loads on the side rather than at the front. They are used for the transport of long, heavy loads in a warehouse or storage yard. Long and narrow, with a rotating cabin, these vehicles can maneuver in tight spaces. Side loaders also provide quality assurance like straddle carriers with the ability to eliminate issues pertaining to space constraints.