If you should confirm that the weight of the trailer is within the towing capabilities of your Pilot, the Tekonsha Prodigy P2 Brake Controller and # 3070-P wiring adapter you referenced would work great for you.
The average horse weighs between 900-1100 lbs. When you combine the weight of one horse with the dry trailer weight, you are dealing with a trailer that can weigh upwards of about 3800 lbs. Throw in water, tack, feed, blankets and the other assorted gear that horses require, and... view full answer...