When I bought my previous trailer, the dealer told me that he fixed them no matter where they were bought but that since I bought it there, I would always be given priority over those. It seemed to be true, when ever I broght it in I got a quick turn-around even though his lot was full.
Have to say though that even in a large metro area it can be hard to find what brand you want. I was interested in a Grand Design but the only place that sold them was a Camping World more than an hour away. Wasn't going to buy from CW and after going to an RV show, the AF edged out the GD.