Take On More Crop With A BIG TOP If money was no object, when you needed more combine capacity you'd just buy a bigger combine. Fact is, money is the main object. So the next best way to increase combine capacity is with a Crary BIG TOP Hopper Extension. Right off the top, BIG TOP adds up to 60% more volume to your machine. Now, you can harvest those extra acres without waiting for the truck to unload. BIG TOP is stacked with value-added features like quick set up, low profile flared design, easy view grain level windows, rust resistant panel length hinges, heavy duty construction and color match paint. Crary BIG TOP Hopper Extensions - big difference.