Appropriate vehicle to pull 29 foot travel trailer?

Wow! I’m so glad to have so many posts so quickly. I didn’t know where to start but now have a good direction to start my search for the best vehicle that we can afford. Thanks!
We live in northern Michigan (Traverse City) and plan to start by going to Arizona, about 2100 miles each way. We’ll be able to avoid mountains on our first trip. We plan to stay in that area, but move within a few hundred miles during the winter. When we become more comfortable driving the truck/trailer combination, we’ll venture farther.

The travel trailer has a ball attachment, not a fifth wheel. We plan to store the trailer for the winter then purchase the truck in the spring, or earlier if we find just the perfect truck. We’ll take short trips to get used to driving and setting up prior to the big trip in the fall of '10.

Thank you for all of your help. I’ve followed many links which lead to other links. I have lots more to learn, but at least know that I’m heading in the right direction.
Many thanks!
Kathie