Aibu - my dh and bil made a trailer to go on back of mountain bike for our ds 2.5 out of a canoe trolley welded to an old seat from a car and strapped our ds car seat to it with good intentions. I don't feel its safe at all but they say its very safe and dh says our D's can ride on back of it when we go for bike rides. I don't want to upset them but I really don't like the idea at all but don't want to sound bitchy about it. Is it really safe? Would they be stopped say by the police of someone? They took a lot of time to make it but I really don't feel happy about it. What are your thoughts?