I have no useful input but reading through the comments I feel the urgent need to tell all the horse girls that you can't just put a non-rider on a horse and tag it along on a rope.
I'm a non-rider and I once sat on a horse and it was horrible. I didn't have the thigh strength to clamp down long. Then the horse lowered its head to eat grass and I thought I was going to die. It never took even one step and it was simply hell.
Please put me on that bike.