As a part of response to viewtopic.php?f=48&t=50669
Why not give horses 1 slot (on the back) with proper texture.
https://s-media-cache-ak0.pinimg.com/56 ... 605a1e.jpg
Or 2 slots but only without a rider (use rope to leash)
http://image.shutterstock.com/z/stock-p ... 254095.jpg
But let's be sane - either car attached or 1 slot + rider or 2 slots and a leash.
Pony power drain should change according to the load of course.