Abstract: A generally horizontal platform is provided for removable support from the side of a truck body having a bay doorway therein and defining opposing upstanding door receiving channels extending along opposite sides of the doorway and a lower horizontal sill structure extending between the lower ends of the opposite side marginal portions of the doorway. The platform includes a horizontal panel structure including opposite side marginal edge portions and opposite inner and outer marginal edge portions extending between the opposite side marginal edge portions. The platform further includes oppositely endwise outwardly directed stub axle portions supported therefrom and projecting outwardly from the ends of the side marginal edge portions adjacent the inner marginal edge portion.