Wow, 9-10" different in height? And still both minis?
I've seen and heard of many different size pairs being driven together but when I now go search for pics/images - guess what I can't find!
Here is a vid of a pair - Horse w/ Shetland pony -
Barry Hook
Here is a website for driving pairs and there are pics of tandem driving -
Driving Pairs
I think between 2008 and 2011 - there were a lot of write ups here on LB about driving tandems. Both had detailed info on how they attached the lead horse to the one hitched to the cart and how they did the lines and what they would do different. Both had lots of pics! I haven't been able to get the search feature to go back past 2013 lately, so I have NO IDEA how to access that now.
O, now I can't get the search feature to go back past my own posts of mid - 2014!! ARRRGH...