Don't make fun of me - bike help

[emsumm]

I want to do a tri or two, or maybe more, and I know I need a road bike.  What should I look for on Craigslist?
Also.  I really would prefer to ride a mountain bike for pleasure, and for towing my kids about in a trailer...I would spend a little more on a nicer mtn bike, but I still think I want to go used.  What brands should I search for on Craigslist?  Anything else I need to know, except everything?

[sadlebred]

1. Don't look on Craigslist if these are your first bikes. You may wind up with something that doesn't fit and you will never ride. Go to several bikes shops and try different models. The sales people will fit you and will help guide you to the right bike. That's what they are paid to do.

Go read the link in my siggy for lots of info.