I made a holder for my phone and set it up on a barrel!
The cart was custom built for me by my awesome Hubby! I wanted it built so that I can do driven obstacle at AMHA shows with a pair but still have the manuverability of a singles cart. It is balanced so that there is just a small amount of weight on their necks, but just about 5 pounds. All I have to do it lean back to raise the end of the pole!
I use secondary straps from collars to the neck yoke so IF the was a malfunction or strap breakage, we won't have a wreck.
This cart is strictly for the arena, I would never take a 2 wheeled cart off road on the trail as it would keep me moving in the seat to keep the balance correct..