There are many campground experts who claim to have necessary experience. I am not an expert but common sense tells me something is amiss with your alignment or may be your steering stabilizer. That is where I would look first, and next would be the rest of the steering components.
Even if they were faulty tires they would not have just worn on the edges like they did. They are not running true and the wear points to that.
I am not a Michelin basher or pro Michelin for that matter. Michelin along with all the other brands has it's issues from time to time.