Like Mark, I too have had no tire failures due to tire quality.
I am in the process of replacing the Load Boss tires on my Landmark primarily due to unfortunate road hazards. A nail puncture to one tire (patched) and recently, a sidewall puncture (non-repairable) to another.
Since my spare is another brand and with no tread wear, I made the decision to replace my tires.
Since most of us will require tire replacement at some point due to wear, age or damage, these tire threads here in the Bighorn and in the Landmark forums are great in that it gives us all a lot of research material to consider.
In my case, I needed load range G tires. These are not easy to find just anywhere. Hopefully all this tire talk will benefit others in their time of need.
Like others have suggested, I too hope that at some point, the factory would offer some tire options to new unit purchasers.
Jim