What appears to be a solid wall of metal is actually a bulkhead. Its function is to protect the driver / operator of a commercial van from cargo that can injure when the van is in motion or comes to a sudden stop.
Bulkheads are designed for specific manufacturers. They are available in solid metal or a metal weave for easy viewing into cargo bay. Need a door closure? No problem. Choose one that swings or slides open and shut. Consider a window shaped opening to pass papers or materials from cargo to driver / passenger during deliveries or when making frequent stops. Be sure to ask about task specific attachments that adhere or are screwed into the bulkhead. Mail, paper holders, clothes hooks, and holders are just a few of the options for ease of operation.