you are absolutely right kookier, the concrete/prep work is just the start.    

we've used a lot of different chute combinations; from a open concrete chute with a portable wooden chute at the end set at 60 deg.(the worst), to a long, all wood chute, totally enclosed, with a movable deck, door on the side, and truck end, also with walkway( worked pretty good),  to a cement totally enclosed loading dock type chute( probably the best).