I don't have an opinion one way or another about who rides what. I will say that I read everything I can get my hands on, and have learned some invaluable knowledge from Dr. Deb Bennett. If you have a horse, you should familiarize yourself with her work. She is a leading expert in equine anatomy and biomechanics. She is all about the horse and advocates that no horse should carry more than 200# for any length of time. No horse. You can agree with it or not, doesn't matter to me one way or the other.
If you are looking for a sturdy horse with the ability to manage a heavier than average load, the most important factor (aside from near perfect conformation) you should look for is a broad, strong coupling. If you don't know what that is, it would behoove you to educate yourself regarding equine anatomy.
The comments and insults on the other board are flat out disgusting. A little humanity goes a long way, folks. The quality of your posts reflect your character......or lack of.