I know of a mid-teen aged retired broodmare that might fit the bill for you. She is only green broke at this time, but wouldn't be too hard to finish. Big stout Paint mare. She is 15.1 or 15.2 and about 1300 to 1400 pounds I would say. I will try to get a price for you if you are interested. She is of good solid foundation type Paint bloodlines too.

Life's tough, it's even tougher if you're stupid. - John Wayne

You can't argue with stupid!