Although I am more of a red fan, Deere seems to have the N scale market cornered. Here is a pair of Kinze 1050 grain carts staged in front of a collection tractors I have. I have 2 versions of this wagon, on both flotation tires, and row crop duals. About the only thing left to do is a white stripe around the top, and a piece of wire added to simulate a PTO shaft in front.
One other item I wanted to mention is that Shapeways is offering free shipping on orders over $75 this week. Here is my shop in case you need some models: www.shapeways.com/shops/NScaleAddict