Hi Pam,
I just want to add in my vote to break it in. When my mom got her Excursion, we actually took her old Mountaineer to the dealer for service, saw the Ex, she said it was two big, my dad and I out voted her, and we left a few hours later with the Ex. (Who would have ever thought we'd be a 2 Ex family now!) Well, that just happened to be Labor Day weekend 2005 (on Friday), and we certainly weren't going to miss two beautiful boating days on Saturday and Sunday. BTW, we were vacationing "up north" as we do every weekend in the summer. Well, my parents decided to take a drive (I don't know where because I didn't go) and logged about 250 miles on. That next day, I pulled the boat to the launch (from TBRV, about 12 miles) and went really easy on it the whole way. Thank goodness there haven't been any problems since, but I would recommend breaking it in a full 500 miles before towing, or go real easy on it.
Do you still have your Trailblazer? If you do, use that until the Tundra is WELL broken in.
Jon