I'm amazed at how solid the bike is. I do hear something shaking/rattling when going over bumps. Something that seems to be loose. I'm curious as to what this may be and it is possible that it is the trunk lid that is making the noise. I did see or hear of issues and certain fixes. I thought I saw rubber bumpers for sale on a website, and saw someone who used the soft velcro in strategic areas. Can anyone tell me of their experience as to validate this for me?