Our back cargo comes with a rear door that opens up vertically and it gives you much needed room that can be utilized as a prep area and additional area to store your goods. (You can add a shelf or table for additional cost). Door is 36"W x 24"H and  has 1 keyed lock and 1 latch.
 
The interior depth is 14 inches x 5 feet wide.  From the interiror you will see that it does not take up the foot space on floor.  There is 17.25" from floor to the start of the back cargo unit.