I can only see it becoming quite dangerous to pony a mini off of such a big horse imo. I've seen someone try it before and even though the large horse was well behaved, the mini clung to it too much and ended up getting hurt and the rider fell off in the process... I really don't see the neccessity in ponying a mini off a horse. As much as we can do many things with minis, you have to be realistic. Depending on the height of the mini, unless you plan to put a small child on it or show him inhand... I don't see how apart from good ground manners, and some fun play time... why this pony needs to have a sound jumping ability etc. Please excuse my ignorance, but I've always seen mini's as more of a pet/breeding/cart or show pony. I don't see the point in ponying one.
Just my opinion, please mini owners correct me if I'm wrong.
♥ Seoul Searchin' for the Lovebug ♥