Thank you for the help everyone. I am taking notes!
Another thought came to mind today. Have any of you ever put a 2x4 balanced on a couple of cinder blocks? Ever stood in the middle of that board as a kid and bounced up and down on it? Then, did you move the cinder blocks inwards and notice that the shorter the distance between the blocks there was, the less the middle gave, it had more support?
Can this be applied to a horses' back? A shorter horse back is stronger compared to a long back? I'm trying to pick out a horse breed I would like if I can't find a really gentle mustang to adopt. Trying to get a 2nd and 3d option in there. Of course, I'm looking for one with a good temperament, that's not need of saying. But what does need saying is that I want one strong enough that when I get on its back I don't feel guilty because it's having to haul my fat bum! >.< I don't want to feel like I'm hurting the poor animal! Draft animals look strong. They look like they'd be harder for me to break riding them a lot. But I don't know enough yet to know up from down. More homework! >.<
The only thing evil needs to thrive, is for good men to do nothing. - Edmond Burke