The upright, or wheel mounting is moved forward, 2 inches more than other carts. The saddle rings have been moved back in the cart.
A rear bar, and small stationary wheel has been added to make extra stability. (This aids when John is backing up, over the speed limit.)
While moving forward, the rear wheel clears the ground by about 5 inches.
With the wheels forward, there is more weight added to the rear of the cart. This makes the dogs own weight, act as a counter balance.
The belly strap is not just for looks. The increased rear weight makes a lift on the cart arms, thereby making a firm lift on the belly strap. This also, decreases the shoulder down pressure. Everyone with a cart, thinks about the shoulder weight.
The cart is harder to flip over, because the wheels are almost centered, and more inclined to pivot, instead of flipping.