Max. You need Max to move the corn meal.
Okay, step-by-step detailed instructions:
1. Walk up to the truck and "activate" a corn dog.
2. Wave it around. Max should grab the truck.
3. Walk to the puddle.
4. Eat the corn dog. Max should shake the truck in frustration, knocking the corn meal into the puddle.
5. Repeat with DeSoto.