I have read a few posts about broken bolts in the suspension areas of trikes. I cannot understand why Stainless steel hardware is frequently used on any trike or motorcycle. I bet your problem is an SS bolt-they are very brittle and will sheer off, under repeated stress. SS tends to be more reliable in a thickness of 5/16" and up-but never on moving point of stress. Replace it with a good grade 8 bolt and you should be good to go.