A vehicle includes a cab portion, a cargo portion, and a panel arranged separating the cab portion from the cargo portion and extending vertically from a floor of the vehicle. The panel is configured to move in a longitudinal direction of the vehicle to vary a size of the cargo portion. The panel includes a first portion extending vertically upwardly from the floor towards a roof and defining a gap therebetween, and a second portion configured to selectively cover the gap and adapted to be arranged at a first position and a second position. In the first position, the second portion extends vertically from the first portion to cover the gap, and in the second position, the second portion is arranged away from the gap.