A truck includes a passenger cabin and a truck bed located rearward of the passenger cabin in a vehicle longitudinal direction. The truck bed includes a bed deck and a pair of spaced apart sidewalls. A tailgate replacement extends across a rear opening to the truck bed and between the sidewalls. The tailgate replacement includes vertically-extending support rails and vertically spaced-apart, laterally-extending support rails that extend between the vertically-extending support rails. A slider is connected to the laterally-extending support rails. The slider includes a first connecting portion that slidably engages a first one of the laterally-extending support rails and a second connecting portion that slidably engages a second one of the laterally-extending support rails.