Have fun on your trip, Jody. I would be interested to hear about how the trailer thing went. My husband's ears perked up when I told him what you were doing.
I sympathize with your son. How long will he be out of action? I fractured my knee many years ago (before I did anything athletic) and it hurt like hell. Right now I am dealing with something in my left knee... it didn't happen cycling, but when I was walking up my hill. I think it's just overuse, strain, but it's worrying me. I've been stretching, icing, lifting light weights to strengthen, and yesterday i bought one of those neoprene braces. Hopefully, it will go away!