He was an avid horse rider so feel sorry for the horses. QUOTE]
Naw.
Shat's weight on a 1100-1200 pound American Saddlebred horse is negligible. No problem unless the rider's bouncing around or unbalanced. Horses mind you hitting their mouths via trying to balance yourself with the reins, but Bill's horses were plenty strong enough for the Shat-weight.
In fact, the difficulty for Shat would be in mounting - that's much harder when you're heavy. I know from personal experience!
Bill's weight has gone up and down over the years. It gets really hard to keep it off for most people after a certain age.
Also, having stood next to Bill on many occassions, I think he was around 5'9". He seems to have shrunk lately though, so if I see him at KSF this month I'll be interested to see if he's still shrinking.