Join Date: Sep 2012
Location: Central Western NSW, Australia
I've been doing a lot of looking into this sort of thing as I am sort of in the horse market and weigh in at 260lbs.
From my research, shorter cob-like horses are typically your best bet. Look for thick bones in the legs, short cannons and pasterns and a horse that stands square, not camped out or under. A short back is important, but can be difficult for the saddle size that our sort need.
The conformation of the leg is really important. I suggest doing some research on leg conformation and learning about all the different faults. I never realized there were so many until I started looking into it.