That is absolutely BRILLIANT This man is a GENIUS!!!
Put this up on the horse Forum, there will be people queueing up to buy it!!!!!! I never liked the idea of driving an easy entry with a team- this is the answer- Get him to patent it ASAP-- you can do it on the internet, it is free and very quick. Just Google "Patenting" there is a whole website on it. Do it, before someone steals the idea, PLEASE