I have a child trailer that I've been hooking up to my steel mountain bike to pull around the little boy I nanny for on the local bike paths. I've always been reluctant to use the trailer with my aluminum road bike, but now that the days are getting so short, I want to start getting some ride time in on that bike during the day. I'd really like to hook up the baby trailer and go for some day rides before it gets too cold for the little tyke. The trailer, baby and diaper bag all together weigh 55-60 pounds. Is this kind of weight being pulled from behind going to weaken the lighter aluminum frame or am I just being paranoid about my beloved road bike?