A lift platform assembly coupled to a floor and capable of transitioning a lift platform between a stow position and a ground level position. The lift platform assembly has one or more arms coupling the lift platform to the floor, a gate mount coupled to the lift platform at an outboard end, a retention gate coupled to the gate mount at a first terminus, and a mount pivot axis defined through the gate mount and parallel to a lift platform plane. The retention gate pivots about the mount pivot axis as the lift platform assembly transitions from the ground level position to the stow position.