Human: I'm trying to find out how to build a sled that will hold a lot of weight. Assistant: 
Building a sled is not too difficult, but it does require some basic knowledge about physics and engineering. First you need to decide on the design of your sled. You should consider the size of the sled, its shape, and the materials you are going to use for construction. Once you have determined these things, you can start thinking about what type of engine or motor you want to power the sled. After this, you'll need to choose a suitable material for the frame, such as steel, aluminum, or wood. Finally, attach the necessary parts, like the wheels, brakes, and other features, to complete the sled.