Fifth wheel hitches connect to towing vehicles via a kingpin that swivels to accommodate turns and a set of rails that run from the hitch to the frame of the towing truck for extra support. These hitches carry heavier loads than regular ball hitches because they allow for the rear axles of the vehicle to hold most of the weight. They attach from the truck bed instead of the bumper for strength and durability. Adaptor rails and bracket kits are hitch accessories frequently used to install fifth wheel hitches.