Personally, I am a big fan of Arnold. I've seen his video. During the training with Wade, Frog Nuo and he moved cars for others at the entrance of the gym. They casually put a towel on it and drove away. Although it is a car, it weighs at least one ton.
He once conducted outdoor training on the beach in Venice and launched the maximum weight of 450bl. There are no specific figures for squats. Legs have always been his weakness. It is estimated to be around 500bl, and the answer submitted is about 700bl.