I don't know if this will help but all rides' supports start with the footers. The holes drilled for them reach bedrock, which varies from ride to ride, and even on the ride itself if it spans a large enough area. Bedrock can be 20 feet or 120 feet depending on the geography in that area. Look at the geometry of the supports. You'll see that the higher up, the thicker the support beams get. Turns are guaranteed to have A frames or some sort of batter bracing. Another thing you can do is look how the support tubes themselves are made. Some are sheets that are rolled in a spiral formation, others are sheets rolled into a cylinder, and some are just fabricated in a cylinder already and require no additional cold working.