If you didn't already know, Pixar likes to tease fans with hidden images of characters from their next film in the one beforehand.
They also like to show Toy Story's Pizza Planet Truck! In fact, the only film they didn't show it in was The Incredibles. (Someone must have not felt the magic that day.)
So! Wonder where Disney-Pixar put the yummy escape wagon in Brave? Well that's right up there (above).