The steering didn't bother me at all. I was on surface streets and did about 85mph on the interstate. The only time I noticed that it does not self-center was as soon as I pulled out of the parking lot. After that it did not feel odd.
For the most part, all of the trucks sitting on lots are preorders waiting on accessories to arrive and be installed.
As for being untested, this is the second model year, but the first for North America. They had test vehicles all around the world for two years before that.
Mine has been at the dealer for over 2 weeks waiting on the accessories to arrive and be installed. I pretty much ordered everything except for the rear winch. Mine is Sela Green as well, but with matching roof