Tow-Between carts are recommended for hillside use over Tow-Behind carts because:
Material in the Tow-Between cart transfers weight to the tractor for increased traction.
Downhill drift of tool and Tow-Between cart is reduced due to the draft load of the seeding tool openers keeping tractor, cart and tool in line while seeding.
Added stability against overturn of Tow-Between cart on slopes is a result of tool draft load onto rear of cart.
A Tow-Behind cart adds to the seeding tool's side drift on steep hills. Drifting of the tool/cart on steep hills will cause uneven row spacing and a potential reduction in yield.