The official rating for this tripod is 13 pounds, but I have a hard time believing that... I have a theory that the 13 pound rating is based on holding a camera in portrait orientation at the maximum horizontal angle.... am I right? I've extended a Giottos 9180 (I think that was the model number) to it's maximum height and put at least 60 pounds of pressure on the head (straight down) and it didn't budge. The Giottos is rated for 26 pounds, but many people say this tripod is "less sturdy" So even though the 3021 is rated for 13... if your camera is just sitting on top of it, you feel that it can hold far more than this right? How much would you say it could hold when set up fully horizontally?