After years of towing with a Toyota Tacoma, I bumped up to a Toyota Tundra. It's so much better in every way (smoothness, stability, power, etc.) that I wish I'd done this one years ago.
I've got a couple weeks to go before I take off for the summer, and need to work on some tires and wheels, and also some company graphics.
The break-in period? Well, I did make a stop at a trailer place to have the hitch height adjusted, and to add a trailer brake. Other than that, I pretty much hitched up and took it to Las Vegas. Probably not exactly factory-recommended break-in.